M4 now "flowing freely" following earlier accident

Two lanes were closed this morning on the eastbound carriageway towards London following the rush hour crash, which happened just before the slip road at junction 11 and involved two cars and a lorry.
After debris was cleared from the carriageway, the two lanes reopened, but drivers were experiencing delays of up to 50 minutes.
It is not yet clear if anyone was injured.
More follows.