Two people remain missing a day after their car came off a road and was swept along a river.
A massive search has been launched for the pair in the River Trent at Nottinghamshire, after their vehicle was washed away on Monday afternoon.
Police said a witness saw the car carrying two people enter the river and drift down the waterway at Hoveringham.
Search teams including divers had desperately combed the river overnight.
But the crews had yet to locate the vehicle or its occupants, Nottinghamshire Police Inspector Heather Sutton said.
She added that police believe they know the identities of the two people in the car.
The relatives of the pair thought to be missing had been informed and were being supported.
Officers are urgently appealing for witnesses or anyone with information that would help their search.
Last night, the search moved down river and into Bleasby, then three more miles towards Fiskerton.
“Challenging conditions” made it difficult to locate the vehicle last night and searches are continued this morning, reports Nottinghamshire Live.
Insp Sutton said: “Yesterday, Monday February 1, we received a report at 4.13pm that a vehicle had left the road at Hoveringham Road and entered the River Trent.
“Sadly, the witness reported that there were two occupants in the vehicle at the time that it entered the river.
“There was an extensive multi-agency response last night between Nottinghamshire police, East Midlands Ambulance Service and Nottinghamshire Fire and Rescue Service.
“Those enquiries continue today with the North West region dive team who are currently searching the river, trying to locate the vehicle.
“Whilst there has been no formal identification of the occupants of the vehicle, we do believe we know who they are. The relatives have been informed and they are being supported by specialist officers and are asking for privacy at this time.
“We are keeping an open mind whilst we are enquiring into the facts of how this incident happened, and we do request the space to allow our police teams to continue their investigation.”
Anyone with information is being urged to call Nottinghamshire police on 101 quoting incident number 500 for February 1.