Three people including a police officer have been stabbed at Manchester's Victoria railway station.

An eyewitness says the knifeman shouted "Allah" after attacking and stabbing innocent commuters, leaving the three wounded.

BBC producer Sam Clack says he heard a blood-curdling scream and saw a man in his 60s with a woman of similar age, and another man, all dressed in black.

He says it looked like they were having a fight but she was screaming.

Clack says the man had a kitchen knife with a 30 centimetre blade.

Police officers used a taser and pepper spray before the officers jumped on the man.