US R&B singer, Chris Brown brought Londons Oxford Street to a standstill on Saturday afternoon after appearing at Nike Town where he signed copies of his new single Wall to Wall.

There was so much hysteria that the 18 year-old had to be escorted out of the building by armed policemen.

A source told us: It was pure pandemonium. Ive been working here for a few years now and never before has any other celebrity drew this many people to the store.

Because of time limits only a few of the hundreds of people who arrived could meet their idol and so afterwards Chris Brown did a walk around the store and then ran outside.

Things soon got tricky for the R&B crooner when fans descended on him from both sides of Oxford Street and tackled the star to the floor where they then began trying to strip his clothes off.

Brown managed to escape unharmed from the encounter (minus muddy clothes) and was quickly rushed back instore by his security where he had to wait until the police arrived to provide him with an escort.

'Archna Sawjani'