SEVERE delays are being reported on the eastbound carriageway of the M4 between Junctions 15 and 16.

The collision occurred at around 5.05pm, with lanes two and three closed just after Junction 15.

It is thought the collision involved several vehicles.

All lanes were reported as being re-opened by 6.30pm but with congestion to Junction 16 for Swindon West taking time to clear.