Officers were called after reports raised concerns about people in the water near Pulpit Rock in Loch Lomond on Saturday, but three people were pronounced dead at the scene.
It is understood that they were Edina Olahova, 29, and her son Raza Haris Ali, nine, and a family friend of theirs, Mohammad Asim Raza, 41.
A seven-year-old boy, believed to be Raza’s son, was taken by ambulance to the Royal Hospital for Children in Glasgow where he is in intensive care.
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The scene of the tragedy near Pulpit Rock on Loch Lomond
A Scottish Police statement said they received the call around 6:40 p.m. on Saturday. He added: “A multi-agency operation took place and unfortunately three people were pronounced dead at the scene.
“Formal identification has yet to take place, but the family of a 41-year-old man, a 29-year-old woman and a nine-year-old boy have been made aware. “
A report on the incident will be sent to the tax prosecutor.
The latest deaths bring the number of people drowned in Scotland to six in 24 hours.
Emergency services were alerted at around 4.30 p.m., but Scottish police said the youngster died at the scene after being recovered from Avon Water.
Formal identification has yet to take place but the schoolboy’s family has been made aware.
A report will be submitted to the Lanark tax attorney.
The incidents came a day after Connor Markward, 16, of Glasgow, died in Loch Lomond. He struggled in the water near the Balloch Country Park pier on Friday, sparking a major search.
Across the UK, people have been warned to be extra careful when swimming in open water after dozens of people drowned in recent hot weather.
The Royal Life Saving Society has called the deaths this week “devastating” and urged people to choose supervised places to cool off.
Scottish Police Deputy Chief Constable Mark Williams said the weekend’s drowning toll had “shown that open water is very, very dangerous”.
Mr Williams said: “The number of open water deaths this weekend is difficult to understand and my thoughts are with the families and loved ones of those affected.
“Hot weather can make swimming and paddling in open water very appealing, but it is extremely dangerous, even for the most experienced swimmers or supervised children. Conditions can change very quickly and there are often hidden risks like deeper water and strong currents.
“The message I want to send to everyone is to be extremely careful. It is best to keep a safe distance from the water if possible. Unfortunately, this weekend has shown that open water is very, very dangerous. If you see someone in the water and immediately call 999 in distress. Remember that you might have difficulty trying to help yourself, so be careful and seek help as soon as possible.
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