A 51-year-old man has been arrested in connection with a series of armed robberies, police have said.
The man was arrested on Monday on suspicion of five counts of robbery.
He remains in custody in a east London police station.
His arrest is part of an investigation into a linked series of armed robberies where shop staff were threatened by a man with a firearm at the following locations:
A bookmakers in High Street, Sutton, on Monday, 4 April
A bookmakers in Burnt Ash Road, Norwood Junction, on Wednesday, 13 April
A bookmakers in Burnt Ash Road, Norwood Junction, on Monday, 18 April
A bookmarkers in High Street, Lee, on Saturday, 23 April
A bookmarkers in Crayford Road, Crayford on Sunday, 24 April