Police divers have joined an investigation into the disappearance of an 18-year-old man in north Wales.
Frantisek "Frankie" Morris, from Llandegfan, Anglesey, was last seen walking in Pentir, near Bangor in Gwynedd, at around 1.20pm on Sunday 2 May.
The North West Police Underwater Search and Marine Unit scoured Afon Cegin, a river near where Mr Morris was last seen.
Detectives arrested three people at the weekend in connection with his disappearance.
Officers from North Wales Police arrested a man on suspicion of causing death by dangerous driving.
A man and woman have also been arrested on suspicion of perverting the course of justice.
One person remains in police custody while the other two have been released under investigation.
Police are appealing for people with information about a number of cars to contact them, saying "they may hold vital information which will help with our enquiries".
The road from Pont Felin, Pentir heading towards Waen Wen will be closed until further notice while investigations are carried out, with police urging people to avoid the area.
Chief Inspector Owain Llewelyn said: "A large police presence will remain in the village of Pentir over the next few days while we continue to conduct searches.
"I would like to thank the local community for their support and understanding while the local roads remain affected by the necessary closures."