They were also called at 6.51pm to reports of a male stabbed on Retford Road, one mile away.
They found a second boy, also aged in his mid-teens, suffering from a stab wound.
He was taken to an east London hospital. There are no updates on his condition as yet.
Three people have been arrested in connection with the investigation and a number of crime scenes remain in place, the force said.
Anyone with information is asked to call police via 101 quoting reference Cad 6572/07May. Alternatively, to remain anonymous contact Crimestoppers on 0800 555 111.
This post originally appeared on Daily Express :: UK Feed