The man arrested on suspicion of stabbing four women in Hampton was released from police custody just hours before the attack.
One of the woman is fighting for her life in hospital. The condition of the other three is stable.
A 66-year-old man was arrested on suspicion of attempted murder.
The same man was arrested in a different borough yesterday (Thursday, May 19) on suspicion of being in possession of a knife and assaulting a police officer.
He was charged with assaulting the police constable and bailed this morning to attend court in June.
The Directorate of Professional Standards have been informed and have informed the Independent Police Complaints Commission (IPCC) this afternoon.
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