Police have released images of a clothing and keys found after a man was seen in the River Tay on Monday evening.
A major search involving a rescue helicopter and two lifeboats was launched to find the man who had been spotted at 5.40pm swimming in the water between Dundee and Broughty Ferry in the Stannergate area.
Although the man has not been found, police recovered clothing and a set of car keys.
Images of the keys and a jacket found by police have been released in an effort to establish the identity of the man.
The search continued until 11pm and included the water under the three oil rigs currently in Dundee Port.
Police have issued a fresh appeal for information on the man seen in the water, including a description of the swimmer.
The man is described as being in his 40s, white and has a beard. He was wearing a red T-shirt, a black jacket, dark trousers and Converse trainers.
Chief Inspector Ian Scott said: “I would appeal to any members of the public who knows someone that matches the description of the man seen to come forward to assist us with enquiries. We have recovered a black jacket and a set of Ford car keys, so the man may have access to a Ford vehicle.
“Officers are continuing with searches today and the Police Scotland helicopter is expected to attend in the area to assist with searching.
“I would also appeal to the man in question to contact us to let us know if he is safe and well.
“Anyone with any information is asked to contact Police Scotland on 101.”