A man, woman and child have died and a seven-year-old boy has been left fighting for his life after getting into difficulty in the water in Loch Lomond.
Police Scotland was called to reports of concerns for people's safety in the water near Pulpit Rock, Loch Lomond, on Saturday evening at about 6.40pm.
A 41-year-old man, a 29-year-old woman and a nine-year-old boy were pronounced dead at the scene, while another boy, seven, was taken to intensive care at Royal Hospital for Children in Glasgow, where he remains.
The force added: "A multi-agency operation took place and sadly three people were pronounced dead at the scene.
"Formal identification has still to take place but the family of a 41-year-old man, 29-year-old woman and nine-year-old boy have been made aware."
The case will now be sent to the procurator fiscal - which investigates all sudden deaths in Scotland.
It means that five people have died in the last 24 hours in Scotland after getting into trouble in water.
Earlier on Saturday, an 11-year-old died after being found in the river at Alexander Hamilton Memorial Park in Stonehouse, South Lanarkshire.
And on Friday, a 16-year-old boy also died at Loch Lomond, at the Balloch Country Park.