Police today said they were right to send armed units to a coach on a motorway, after a passenger saw what turned out to be smoke from an electronic cigarette in someone's bag.
The coach was stopped on the M6 Toll road.
Passengers were taken off by armed police, decontamination units were set up and the motorway was closed for more than five hours.
Mark Gough reports now on today's huge police operation.
The M6 toll motorway was closed today as police investigated a security alert which police found to be an electronic cigarette.
The M6 toll has been shut following a "police-led incident. There are unconfirmed reports this is a counter-terrorism operation.