Statement on incident in Southend Arterial Road
A London Ambulance Service spokeswoman said: “We were called just before 5.15pm to reports of an incident at Southend Arterial Road, Hornchurch.
“We sent a number of resources to the scene including three ambulance crews, our Hazardous Area Response Team, a single responder in a car and a duty manager. The first of our medics arrived in under five minutes.
“We have now treated four patients at the scene and taken them all to hospital.
“We remain on scene.”