Firefighters rescued two men and one woman from the water at Heron Quay in Poplar.
The Brigade’s Fire Rescue Unit crews used water rescue equipment and were assisted by the Police Marine Unit and London Ambulance Hazard Area response team.
A London Fire Brigade spokesperson said: “The best thing you can do if you see someone in difficulty in the water is to call 999, try to give an exact location about where you are and keep your eyes on the last spot you saw them. If you go into the water to rescue people, pets or belongings, you could be putting yourself at risk as well.”
The Brigade was called at 1807 and the incident was over by 1858. Two fire engines from Poplar, Millwall fire stations and a fire rescue unit from Bethnal Green attended the scene.