Four youths who were being questioned about the murder of a 22-year-old surveyor in a churchyard were released last night.
A 15-year-old and two 17-year-olds, who were detained in Birmingham on Sunday by detectives investigating the death of Paul Tanner, were released without charge.
An 18-year-old from the Newtown area of the city was released on police bail pending further inquiries into the killing, which happened in St Paul's Square early on Friday.
Mr Tanner, who lived in nearby Hockley, had been returning from a night out with friends. He died in hospital later on Friday. It is thought he was the victim of an attempted robbery.
Earlier, Mr Tanner's family issued a statement expressing their gratitude for the support they have received from friends since the incident.
In it, Mr Tanner's parents and two brothers, said: "Paul was a loving son, caring brother and loyal friend and his tragic and untimely death in such horrific circumstances will leave a huge gap in the lives of those who knew and loved him.