A man has been left in a critical condition in hospital following an alleged kidnap and assault in Ilford.
It comes after a fight, in the early hours of Sunday morning, between about 20 men at the Icon Bar in the town's High Road.
Later that day, a teenager was found in a semi-conscious state in a river.
At about 1200 BST on Sunday, police were called after a dog walker saw an 18-year-old man in the River Roding at Wanstead.
He was suffering from severe shock and was semi-conscious.
He had facial, neck, shoulder and abdomen injuries and suspected hypothermia.
He was taken to an east London hospital where he remains in a critical condition.