Four held in missing Nottingham man 'murder' inquiry
Four men have been arrested on suspicion of murdering a man who has not been seen since 5 January.
Polish born Bogdan Nawrocki, 22, who lived in Radford, has not been seen despite a large-scale search.
A murder inquiry was launched after police searched a house in the area where he lived.
The men are aged between 27 and 46 and remain in police custody. Police have again appealed for anyone with information to come forward.
Det Ch Insp Tony Heydon, who is leading the investigation, said: "I had to tell Bogdan's sister that I believe he has been murdered.
"I urge anyone with information about Bogdan to call us in absolute confidence."