Emergency services are at the scene of a collision on the M4.
The incident, involving two vehicles, happened before 5pm today, Wednesday 28 December, eastbound between Junction 15 (Swindon) and Junction 14 (Hungerford).
Traffic is not moving eastbound, and there are delays westbound as a result of drivers slowing down to look at the incident on the opposite carriageway. 
Further information to follow.
