Police could see the back doors of the lorry moving as the people inside knocked to be let out, the officer in charge of the investigation has said.
Somerset Area Superintendent Geoff Wessell spoke to ITV News:
More top news
New test could help doctors identify the signs of lung cancer up to five years before the disease shows up on traditional scans.
The Police Federation is pushing for a wider rollout of Tasers , and a new model, the X2, is awaiting Home Office approval.
Charity says social media is helping fuel a nation of 'deeply unhappy' children as figures show rise in number hospitalised over self-harm.