Police called after violent man armed with a knife picked up a baby . He put child down when officers arrived before stabbing policeman in head . The man , 20 , was arrested on suspicion of attempted murder last night . Baby was not harmed in the violence in London , south Walworth . Police officer taken to hospital for treatment and has been discharged .
Police called after violent man armed with a knife picked up a baby . He put child down when officers arrived before stabbing policeman in head . The man , 20 , was arrested on suspicion of attempted murder last night . Baby was not harmed in the violence in Walworth , south London . Police officer taken to hospital for treatment and has been discharged .