Police received multiple calls about attacks that included threats, robbery and vandalism across the city.
Five men - two aged 22, and others aged 24, 27, and 39 - suffered a range of injuries. Three required hospital treatment. None of the injuries are said to be life-threatening.
Police said a 36-year-old white Scottish man was arrested at around 9.30pm. Officers said there was no further threat to the public.
The Muslim Engagement and Development organisation said that several of those injured were Muslim. The Scottish Association of Mosques (SAM) said two of those hurt were "reportedly attacked after attending prayers at their local mosque".
Video posted on social media appeared to show a man with a knife, while another showed a topless man on the ground shouting "I'm protecting the country" as he was held by a police officer.
Attacks 'latest in an alarming pattern'
Assistant Chief Constable Catriona Paton said it was a "shocking" incident and that her thoughts were with those affected.
She said: "I want to send a clear message of support to all our communities that there is no place for racism or faith-based hate in a Scotland which is at its best when we stand together.
"Officers responded to multiple reports of a fast-moving sequence of events across Edinburgh before arresting a man and public safety was our priority. Extensive work is ongoing to establish all the circumstances."
SAM said in a statement: "The attacks in Edinburgh are also the latest in an alarming pattern of hostility and violence directed towards Muslims, mosques and Islamic institutions across Scotland.
"In recent months, communities have witnessed mosques being targeted, racist incidents directed at Muslim communities, and a broader rise in anti-Muslim rhetoric both online and offline."
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Police were called at around 4:20 am on Saturday, 20 June, to reports of a stabbing in Battersea following "a potential altercation" on Glycena Road, Battersea.
Officers attended with the London Ambulance Service and London's Air Ambulance and found the teenager had serious injuries.
Despite the efforts of paramedics, he was pronounced dead at the scene. His next-of-kin have been informed and are being supported by specialist officers.
The Metropolitan Police have appealed for witnesses, and are particularly keen to speak to anyone who may have seen a group of men running in Lavender Hill between 4 am and 5 am on Saturday.
No arrests have been made at this stage.
Detective Chief Inspector Brian Howie said: "This is a critical stage of the investigation and I am appealing directly to the public: If you were in the Lavender Hill area between 04:00hrs and 05:00hrs, specifically Glycena Road, Acanthus Road or Pountney Road, and witnessed a group of males running, please come forward.
"Any information, no matter how minor it may seem, could prove crucial. CCTV, doorbell or mobile phone footage may provide vital evidence.
"I would also urge members of the public not to assume that information has already been shared, any detail could be of significant importance to the investigation."
Anyone with information or footage is asked to contact police on 101, quoting CAD 1567/20JUN26. Alternatively, information can be provided anonymously via Crimestoppers on 0800 555 111.
The US president had told an Italian TV channel: "She begged me to take a picture with her. She wanted a picture with me so badly. I wouldn't have taken it, but I felt sorry for her."
In an Instagram post yesterday, Ms Meloni said in response: "Donald Trump's statements are completely made up. I am frankly astonished. I don't know why the president of the United States behaves like this towards his allies."
Mr Trump then said on Truth Social: "Italian Prime Minister Gigiorgia [sic] Meloni asked, over and over, for a picture with me during the G-7 meeting in France.
"She is doing poorly in Italy with her level of popularity, possibly because she turned down the United States of America, a Country that truly loves and protects Italy, when it came to denying Iran from obtaining or developing a Nuclear Weapon (But so did NATO, for that matter!).
"She wouldn't even let us use Italy's landing strips or runways, a great logistical inconvenience, and this despite the fact the U.S. contributes hundreds of Billions of Dollars a year to protect Italy, and other "so-called" NATO Allies.
"Now, after the United States defeated Iran militarily, she wants to be friends again in order to get her 'numbers up.' No thanks!!! President DJT."
In the latest response on Saturday, Ms Meloni said the "constant, unprovoked attacks are senseless".
She continued: "As for my popularity, being your friend certainly has not helped it, nor does it depend on my relationship with you.
"My popularity depends on my ability to defend Italy's national interest, and that is exactly what I have always done."
The Italian leader said she would not return to the subject after today's response.
Diplomatic fallout
Following Mr Trump's comments that she had "begged" him for a photo, Italian foreign minister Antonio Tajani said he was cancelling a planned US visit next week.
Mr Tajani said in a post on X: "The serious and offensive words of President Trump towards Prime Minister Giorgia Meloni offend the whole of Italy."
Now Sky News understands several ministers won't be attending 4 July celebrations at the US embassy in Rome as the row escalates.
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The heated exchange broke out just days after signs emerged at the summit that the two right-wing leaders had ironed out previous strains in their relationship following tensions over the Iran war.
Video from the event in Evian, which ran from Monday to Wednesday, showed Ms Meloni and the US president in conversation, sitting side-by-side on a small sofa.
But Mr Trump suggested he had only indulged Ms Meloni by speaking with her.
"She's probably happy I talked to her. I didn't have to talk to her," Mr Trump was quoted as saying by La7 TV channel in a brief interview, after he asked the journalist about Ms Meloni.
Ms Meloni, once a vocal supporter of Mr Trump and the only European leader to attend his inauguration in 2025, criticised him this year for his angry response to Pope Leo's condemnation of the Iran conflict.
The US president accused her of lacking courage, telling Italian newspaper Corriere della Sera in an interview: "I'm shocked at her. I thought she had courage, but I was wrong."
Ms Meloni had also criticised Mr Trump for acting with far greater deference to the West's enemies than he does towards established allies
French Prime Minister, Sebastien Lecornu, called a crisis meeting with 14 of his ministers this morning, with red and amber heat warnings active in 80 of the country's departments.
A significant temperature rise is expected across France from Sunday until at least Tuesday, with around 53.5 million people, or more than three-quarters of the French population, affected by the red and amber warnings on Sunday, according to the latest population estimates from Meteo-France, the French national forecaster.
Monday could see average temperatures across mainland France reaching their hottest ever, while top temperatures in many areas could peak between 37C and 42C (99F-108F) - levels which in some places would be unprecedented for any month of the year.
The forecaster warns the heat wave could be as long and severe as the one in August 2003 if predictions prove accurate.
Several local authorities have cancelled the popular annual music festival Fete De La Musique due to take place throughout France tomorrow.
And in a bid to keep festivalgoers safe during the intense heat, the government has forbidden the consumption of alcohol at state-organised events in the 35 departments placed under red alert, including the capital Paris.
There's also a risk of violent storms across the country.
See the weather forecast where you are
Spain is also seeing an ongoing heatwave, with red and orange weather alerts in place for Monday and Tuesday, which are expected to be the hottest days.
Temperatures of 37-39C (98.6-102.2F) are expected on Tuesday across the interior of the Iberian Peninsula and the Balearic Islands, and 40-42C (104-107.6F) in the Tagus, Guadiana, and Guadalquivir valleys, according to AEMET, the Spanish Met Office.
They also warn that temperatures as high as 44C (111.2F) could be seen on Tuesday in isolated areas.
Portugal too is heating up, with the hottest temperatures expected on Tuesday and Wednesday, and temperatures expected to climb as high as 42C (107.6F), according to IPMA, the Portuguese Institute for Sea and Atmosphere.
Most of Germany is also under a heat warning, according to Deutscher Wetterdienst (DWD), Germany's official weather service, with temperatures approaching 38C (100.4F).
Italy too is bracing for a heatwave, with unusually high temperatures expected to hit the peninsula over the weekend.
According to the weather forecast website IlMeteo.it, temperatures in northern and central regions are set to reach 40C (104F) for the first time this year in several cities.
All countries are under storm alerts as well.
Here in the UK, an extreme heat warning is in force for early next week, with temperatures predicted to peak around 34C (93F).
An amber extreme heat warning for Monday and Tuesday covering most of the South East, stretching to Norfolk, and parts of South Wales was expanded across east Wales and much of the Midlands on Saturday afternoon.
The Met Office says the low 30s are likely in southern England on Sunday, before the heat is expected to "expand and intensify" on Monday and Tuesday.
Humidity is set to be higher than last month's heatwave and the "tropical night" threshold - where temperatures don't fall below 20C (68F) - will be met in some areas.
The forecaster says there's a 40% chance of beating June's highest-ever temperature of 35.6C (96F), set in 1957 and 1976.
Focusing on the impact of the heatwave on the UK, Sky News weather presenter Jo Wheeler said: "The European heatwave, the second of 2026, has been caused by high pressure which, over the next few days, will extend into parts of Britain. For several days, we'll experience high temperatures, both day and night, along with high humidity.
"Although some southern locations will meet heatwave criteria, it's unlikely to be countrywide, nor particularly long-lived, with temperatures dialling down a bit by the end of the week."
Meanwhile, scientists say climate change is making heatwaves more frequent and intense across Europe, raising the risk of health emergencies and economic disruption during the summer months.
The Met Office says the low 30s are likely in southern England on Sunday, before the heat is expected to "expand and intensify" on Monday and Tuesday.
Humidity is set to be higher than last month's heatwave and the "tropical night" threshold - where temperatures don't fall below 20C (68F) - will be met in some areas.
The Met Office amber extreme heat warning for Monday and Tuesday covers most of the South East, stretching to Norfolk, as well as parts of South Wales.
The forecaster says there's a 40% chance of beating June's highest-ever temperature of 35.6C (96F), set in 1957 and 1976.
It will also be hot further north at the start of the week, with 29C (84F) forecast in Manchester, 27C (80F) in Newcastle, 25C (77F) in Glasgow and 24C (75F) in Belfast.
"Temperatures have topped 30C in places this afternoon but the real heat has yet to reach us," says Sky News weather presenter Jo Wheeler.
After a slight cooling on Saturday, she says high pressure will "tap into the fierce heatwave over the near continent resulting in temperatures climbing day on day".
High humidity will make things "quite uncomfortable", Wheeler adds.
It's a message echoed by Met Office forecaster Honor Criswick, who says the upcoming heatwave will bring humidity "quite a bit higher" than the last one.
"It's just going to make it feel that bit muggier and that bit more humid during the day and overnight as well," she said.
The Met Office alert runs parallel with one from the UK Health Security Agency warning people to look out for the elderly and those with underlying health conditions.
See the weather forecast where you are
Travellers heading to Europe for an early summer break could also be hit by unexpectedly high temperatures.
More than 50 areas of France are on heatwave alert, with interior minister Laurent Nunez warning of 40C (104F) in the day and a sweltering 30C at night in some parts from Sunday.
Meteo-France - the French Met Office - describes the upcoming surge as "widespread, prolonged and intense".
The water safety message is also being repeated after last month's UK heatwave - which set a new May record of 35.1C (95F) - saw at least 15 people die, including nine children.
Cold water shock - which can induce panic and rapid breathing - is still a possibility as sea, lake and river temperatures remain surprisingly cold.
People entering the water should go in slowly and gradually and swim in a lifeguarded area if possible, the RNLI advises.
Explainer: What is cold water shock?
"If you find yourself struggling in the water, remember to Float to Live: tilt your head back so your ears are submerged, relax and control your breathing," the RNLI's Samantha Hughes said.
"You may need to gently use your hands to help you stay afloat, and it's OK if your legs sink - everyone floats differently."