Striker Didier Drogba guided an Ashley Cole cross into the top corner to put the visitors ahead.

Striker Didier Drogba guided an Ashley Cole cross into the top corner to put the visitors ahead.

Premier League leaders Chelsea left Arsenal’s title challenge reeling by beating the Gunners to increase the gap to 11 points on their London rivals.

Striker Didier Drogba guided an Ashley Cole cross into the top corner to put the visitors ahead.

Another Ashley Cole delivery was then diverted into his own net by Arsenal defender Thomas Vermaelen.

Drogba put an elaborate seal on a deserved victory when he powered in a 25-yard free-kick late on.