The fourth day of a search operation which started after reports that a man had fallen into the River Lagan in Belfast is under way.
The operation began after the emergency services were told a man was seen near Queen's Bridge on Saturday afternoon.
Police are also investigating a member of the public's claim to have seen a man emerging from Belfast Lough at Whitehead about an hour later.
It is believed the man had a backpack and was wearing dark-coloured clothes.
A member of the public said a man, who matched the police's description, was seen about six miles along the coast, walking towards Newtownabbey.
Appealing for information, a police spokesman said anyone who either saw someone matching that description or who was missing a loved one should contact detectives.
The police helicopter and divers went to the scene on Saturday afternoon and the Lagan Weir was closed overnight.
It is understood the river bed and the surrounding area was dragged by Belfast Harbour Commission.