By Sharon Marris, news reporter
A six-year-old boy swept away after falling into a river in Kent is "unlikely" to be found alive, the police officer leading the search has said.
Sonar equipment is being used to look for Lucas Dobson after he slipped into the River Stour on Saturday during a fishing trip with family.
Members of the public have joined search-and-rescue teams to scour river banks and waterways in Sandwich.
Superintendent Amanda Tillotson from Kent Police said more than 100 emergency services staff and 200 volunteers had been taking part.
Asked how likely a positive outcome is, she said: "Obviously as time has gone on now I think it is unlikely, unfortunately.
"But, we will continue to search and obviously I would like to have a positive outcome, I would like to find Lucas, we are getting increasingly concerned with the amount of time that is going on now.
"But it is really important that we continue to search for Lucas and continue to do that for the family, and my heart goes out to them, it really does."
More from Kent
Lucas's aunt said his father had jumped in after the boy fell between a jetty and a boat but "the current was too strong, he had already gone".
"He was with his dad and his dad's friends along with other children," Maciee Stanford, 18, told the Mirror online.
"The incident happened because our Lucas was on the jetty and tried to step from there on to the boat but he fell in between the jetty and the boat.
"As soon as he fell the three adults jumped in after (him) but the current was too strong, he had already gone in the short amount of time he could not be found.