Police were called to a serious assault in North Hill Drive at around 11.30pm.
A 19-year-old man had suffered stab wounds to his neck, chest, arm and leg.
He had been sat with another teen at a bus stop in North Hill Drive when they were approached by suspects on mopeds.
An Air Ambulance took the man to hospital where he remains in a serious, but stable condition.
If anyone has any information, they are asked to call Crimestoppers anonymously on 0800 555 111 quoting reference CAD CAD 8838/ 5thSept
Tags: Havering, Harold Hill
