Police say they are "extremely concerned" for the welfare of a missing Bristol student.
Olisa, 20, was last seen at his address in the Redland area in the early hours of Saturday (May 1).
He was wearing a grey YG hoodie with a picture of a black goat on the front, and either black shorts or black joggers.
Olisa may have a black racer style bike with him, with a black saddle and blue tape on the handlebars.
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An Avon and Somerset police spokeswoman said: "If you know where Olisa is, call 999 quoting reference 5221094539.
"If you have any other information which could help, ring 101 and give the same reference."
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