Undercover police and armed officers have carried out an operation on North Street (10.30am)
Around a dozen police were involved.
In full view of shoppers and bus passengers armed officers shouted at the man to get to the floor before handcuffing him and emptying his pockets.
Police confirm they have arrested a man on suspicion of robbery after a suspect robbed a newsagent and tried to rob a post office in Brighton this morning (Wednesday 6 December).
The suspect was detained in North Street by firearms officers at 10.20am after a report of an attempted robbery at the post office in St James' Street at 9.05am and a robbery at 9.40am at Dyke Road News in Dyke Road.
A man armed with a gun demanded money at both locations. He left empty handed after staff refused at the post office but stole cash from the till at the newsagents.
A man is in custody. An imitation firearm, a hammer and a lock knife were recovered at the scene of the arrest.