Police and members of Foyle Search and Rescue have been conducting seaches along the River Foyle in an effort to locate local missing Derry man Eamonn Moore.
21-year-old Eamonn, from Jefferson Court in the Magazine Street are of the city centre, has not been seen since he left his apartment on Saturday morning.
It is understood that his family received what they regarded as worrying texts from him at the time.
Members of his family have told the media that they received what they regard as worrying texts from him at the time and that his disappearance was totally out of character. They have said that he was struggling to come to terms with his mother's death two years ago.
Mr Moore's uncle, Liam Healy, make a direct appeal to him through the BBC: "We're very, very worried. We're very concerned. We've been searching everywhere for you. If you're out there, please, please contact us.
"Your grandmother is upset, your sisters are upset and your father is upset. Just contact us if you're out there."
Eamonn was last seen wearing blue jeans, a black coat with red stripes on the breast and black boots. He is 6ft 1in, of slim build with a pale complexion and sandy, fair hair.
Police are asking anyone who has seen him or knows anything about his whereabouts to contact Strand Road Police Station on 0845 600 8000.