A two-year-old boy viciously attacked by a dog has undergone surgery after one of his ears and part of his nose were torn off.
It is believed the boy also had serious damage to one of his eyes.
The toddler was attacked by a Staffordshire bull terrier in a neighbour's back garden in Swindon.
London Tonight's Marcus Powell has spoken to a local resident who saw a police officer being attacked by a dog in east London.
Watch the interview here
A Scotland Yard 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 pit bull-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."
Four of the five police officers who were mauled by a dog during a raid in east London have been described as being in a serious but stable condition.
The remaining PC suffered minor injuries.
Five police officers have been taken to hospital after being mauled by a dog during a raid.
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.