West Midlands Police have released video footage of the man who killed two Big Issue sellers cleaning blood from his hands, arms and shoes following the stabbings.
John Ward ran into the Odeon on New Street, Birmingham, where he approached a member of staff and asked her for water and tissues.
Police say they arrived at the cinema within minutes and immediately arrested him. A search around the area found the murder weapon in an alleyway nearby.
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A suspect lies spread-eagled on the floor with armed officers standing over him.
The road was closed and surrounding properties were evacuated.