Police are questioning three youths - aged 15, 17 and 18 - on suspicion of robbery at a police station in north London.
The motive for the attack is unclear at this stage.
More top news
London Underground's latest offer to try to rescue its troubled Night Tube' includes a pledge to deliver 'a compressed working week'.
The Dabbous restaurant in Fitzrovia, central London, has been ranked zero by the Food Standards Agency.
The campaign involved blasting dirt off the streets in Shoreditch. The council says the intelligence organisation did not have permission.