Two young men are fighting for life and another was seriously injured after two separate knife attacks in east London within hours of each other.
Officers were called to Forest Lane, Forest Gate, shortly before midnight on Thursday night following reports of a stabbing.
Two men, aged 19 and 23, were found with multiple injuries and rushed to hospital.
Police said they are both in a critical but stable condition.
A 17-year-old man has been arrested on suspicion of attempted murder and is in police custody.
Hours earlier, at 4.13pm, an 18-year-old was found stabbed in the leg on Chingford Road, Walthamstow.
He was rushed to hospital where his condition was initially described as critical.
His injuries are no longer believed to be life-threatening and he is said to be in a stable condition.
There have so far been no arrests, police said.
Investigations continue into both incidents and Section 60 stop and search warrants have been issued in the boroughs of Waltham Forest and Newham until later today.
Anyone with information on the Forest Gate attack is asked to contact police on quoting the reference CAD8578/09JAN.
Anyone with information on the Walthamstow stabbing is asked to call 101 quoting 4994/9JAN.
