Volunteers searching for a missing teenager have been urged to take extra care along river banks.
More than 100 people have joined family and friends looking for James Sheehan, who disappeared in the early hours of Sunday in Arklow, Co Wicklow.
Divers from the Garda water unit, the Boyne river rescue and members of the Civil Defence are also part of the major operation to locate the 18-year-old.
Searches are being carried out in Arklow town and the surrounding areas, including the reed beds at the Avoca River as it falls within a 1,500-metre radius of where the teenager was last seen.
A Garda spokesman warned the area could pose potential risks.
"As a result of this, we would ask that the local community allow the trained personnel present to carry out such searches of these areas," he said.
Mr Sheehan, from Ballyduff Road in Arklow, was last seen leaving Sally O'Brien's nightclub at 2.38am on Sunday.
He is 6ft 2in and of athletic build, with short, tightly-cut red hair. He was wearing a light grey Henley hoody with a neon orange lining, blue jeans and tan Kickers shoes.
CCTV from around business premises in the town has revealed that he left the club and walked down Condren's Lane. The battery on his phone expired on Sunday morning.
Anyone with information is asked to contact Arklow garda station.