Murder squad detectives were today questioning a man after finding a body at an address in Brighton.
The dead man was discovered at a property in Crown Street at about 2.40am on Sunday.
A police spokesman said: "His death is being treated as suspicious and a man has been arrested in connection with it."
A Home Office pathologist was expected to carry out a post-mortem examination today.
Police have not identified the dead man while officers try to trace his relatives.
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