The crash happened at the junction of the A1306 and A13 at 10.30am today (August 20).
Medics arrived with firefighters and a man was taken to hospital.
His condition is unknown at this stage.
We have contacted Metropolitan Police for further information.
A London Ambulance Service spokesperson said: “We were called at 10.30am today (20 August) to reports of a road traffic collision at a roundabout on the A1306 and the A13, Dagenham.
“We sent an ambulance crew and an incident response officer to the scene.
“We treated one patient and took him to hospital.”
A London Fire Brigade spokesperson said: “We were called at 1037 today to a report of a road traffic collision near the A13 in Dagenham.
“Firefighters attended and discovered a car and a van were involved.
“No one was trapped and firefighters assisted emergency service colleagues in making the scene safe.
“One fire engine from Barking Fire Station attended the scene.”
