A £10,000 reward has been offered to help catch the killers of a surveyor who was stabbed to death in a churchyard as he returned from a night out.

The Birmingham Post's sister paper the Evening Mail and local radio station BRMB is offering the reward to persuade anyone with information to "shop" the killers of Paul Tanner.

The 23- year- old was stabbed to death in St Paul's Square in the early hours of last Friday after being mugged. He was killed despite offering no resistance to his attackers.

A front page editorial in the Evening Mail, which also called for local businesses to offer more cash for the reward, followed a plea by Mr Tanner's family to help catch his killers.

The paper said: "No one who saw Paul's heartbroken father and brother appeal for witnesses can fail to have been moved by this tragedy.

"We want these killers off our streets. Birmingham is a fantastic place and we want people to come here in their thousands to enjoy what is on offer.

"These killers - and other knife-carrying thugs - should know there is no place for them in this great city."

Mr Tanner's father, John, aged 53, from Blakedown, Worcestershire, said: "There must be people out there who know who did this. These people must be found.

"Someone has got to come forward and tell the police. I watched the life draining out of my son for 20 hours at hospital."

Detectives, who arrested and later released four youths in connection with Mr Tanner's death, said three youths had been "active" in the St Paul's Square area on the evening of the stabbing.