A major search took place on Saturday in the River Tay in Perth after a man was seen entering the water earlier in the morning.
Despite extensive efforts the search was to no avail with emergency services expected to resume the operation on Sunday morning.
Emergency personnel were alerted to a male who had been seen on the Queens Bridge in Perth around 4am on Saturday. He was seen to enter the water shortly afterwards.
This led to a multi-agency search operation swinging into action involving Police Scotland, the Scottish Fire and Rescue, the Coastguard service, a RNLI lifeboat from Broughty Ferry and a rescue helicopter from Prestwick.
The initial search focused on the River Tay near the Queens Bridge but water rescue teams from the fire service then concentrated on the lower Friarton area of the river around 8am, with the rescue helicopter circling overheard.
The helicopter then probed a stretch of water near Inchyra around 8.30am.
Scores of emergency vehicles involved in the operation were parked in the South Inch car park in Perth, including staff from the ambulance service and a police incident response unit, as the search for the man continued, to no avail.
A spokesperson for Police Scotland said: “Police Scotland can confirm that a search and rescue operation is currently ongoing in the Perth area.
“Emergency services were alerted to a male on the Queens Bridge in Perth around 4am on Saturday. The male was seen to enter the water shortly afterwards.
“Resources from police, coastguard and Scottish Fire and Rescue are at the scene.”
And a spokesperson for the RNLI based at Broughty Ferry added: “Broughty Ferry RNLI were alerted just after 4.15am on Saturday. A person was reported to have entered the water at the Queens Bridge, Perth.
“An inshore lifeboat left the station at 4.30am and was active in the search operation in the River Tay near to Perth.
“Another lifeboat crew was dispatched from Broughty Ferry around 8am to relieve the crew currently who took part in the operation.”
A spokesperson for the Scottish Fire and Rescue said their staff stood down from the rescue around noon on Saturday along with RNLI crew from Broughty Ferry.
Police later stood down around 4.30pm.
There were seven fire units at the scene when the incident first came to light, including a specialist team from Glenrothes.