A police officer has been stabbed in the head while confronting a man who had grabbed hold of a baby in London.

Police say officers were called to Cooks Road in Walworth around 8pm on Saturday following reports of a man behaving in a violent manner.

Officers attended the address and tried to speak to the man.

After he put the baby down he attacked police, stabbing a male officer in the shoulder and head.

The attacker (20) was arrested at the scene on suspicion of attempted murder.

The injured officer was taken to hospital for treatment, but has since been discharged.

An investigation into the incident is continuing.