A fourth victim has come forward following a knife attack inside two health centres in Bow today.

East London Advertiser: The crime scene at St Stephen's Health Centre in Bow. Picture: Dominic Lipinski/PAThe crime scene at St Stephen's Health Centre in Bow. Picture: Dominic Lipinski/PA

Armed police were called to the Tredegar Practice on St Stephen’s Road, were they found two men aged 24 and 33 suffering from knife wounds.

Shortly afterwards a 77-year-old woman was stabbed 50 metres away in St Stephen’s Health Centre off nearby William Place.

The three were all taken to hospital with non life-threatening.

A woman aged 40 was also injured but made her own way to hospital where she was treated and discharged.

A 40-year-old man was arrested in St Stephen’s Health Centre on suspicion of causing grievous bodily harm.

He was taken to hospital and treated for a minor injury and has since been discharged and is in police custody.

Farhad Alom, 25, who witnessed the attacks, said, a bystander at St Stephen’s could not get to safety as he was in a wheelchair.

One woman, who did not want to be named, said she saw the knife attack at Tredegar Practice and a man stepped in to stop the attacker.

The woman said she hid in a side room after witnessing “the entire event”.