The constables were attacked by a ''pit bull-type'' animal as they attempted to arrest a suspect in east London, Scotland Yard said.

A dog unit and firearms officer were called before the dog was ''contained and subsequently shot dead'', the force added.

The man - in his 20s - was arrested and is in custody.

Four of the officers were described as being in a serious but stable condition. The remaining Pc suffered minor injuries.

A force statement said: "Police attended an address in Albert Square to execute an arrest warrant at approximately 9am... While officers from Newham attempted to arrest a male suspect, they were attacked by a pitbull-type dog.

"A dog unit was called to the scene and CO19 Specialist Firearms Command also attended. The dog was contained and subsequently shot dead."

Pools of blood were visible near the entrance to the property in Albert Square.

Several officers suffered bites to their legs and arms.