Emergency crews were searching for a person in the River Tay near Perth.
A police helicopter was scouring the river two miles east of Friarton Bridge, near the Sleepless Inch wastewater treatment works on Monday evening.
It reportedly had its searchlights on as it focused on the water.
A Police Scotland spokesperson said: “This is in connection with a concern for person, and searches are ongoing.”
Scottish Fire and Rescue Service drafted in appliances from Perth and Blairgowrie, and boats from Perth and Kingsway.
“We were there to assist the police, who contacted us at 7.22pm on Monday,” a SFRS spokesperson said.
“We received the stop message at 11.20pm,” they added.
A lifeboat from Broughty Ferry was deployed to the scene at 7.53pm.
Coastguard Rescue Teams were sent from Dundee and St Andrews.
Police Scotland has been asked to provide an update.
