A teenager was arrested following a machete attack in Plaistow on Friday.
Emergency services were called to Chesterton Terrace at about 2pm to reports of a teenager, believed to be 17, suffering from an arm injury.
He was taken to an east London hospital and it is believed his injuries are not life threatening.
A male, aged 16, was arrested on suspicion of GBH with intent and has been bailed pending further enquiries to a date in late July.
Officers in Newham continue to investigate the attack.
Anyone with information should contact Newham Police via 101 or call Crimestoppers anonymously 0800 555 111.
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