Police say the security alert they received this morning which resulted in the closure of the M6 Toll was because of an electronic cigarette.
Police received a report of vapour escaping from a bag on a Mega Bus on the M6 Toll road, on investigation it turned out to be a device to assist smokers to quit, also known as an electronic cigarette.
They also say there was no chemical spillage and have made no arrests.
Almost fifty people had to be evacuated from a coach near Birmingham after armed police closed a section of the M6 Toll motorway.
The road near Lichfield was closed in both directions between junctions 3 and 4 after allegations were made against one of the passengers on board the Megabus coach from Preston to London.
Unconfirmed reports suggested a man was seen pouring liquid into a smoking bag on board the coach.
Police later said they reacted following a report at 8.20am this morning from a 'genuinely concerned' member fo the public about suspicious activity on a coach travelling on the M6 Toll.
Armed police officers could be seen positioned next to the single-decker coach on the south-bound carriageway, as passengers were led off the vehicle one by one.
Police surrounded the cordoned-off area, which spread across one lane of the toll road.
Police dogs and their handlers were also seen walking nearby.
Several other cordoned off areas could also be seen, along with what appeared to be bright yellow tents on the other side of the toll plaza.
Emergency service vehicles were parked at the toll plaza, about 200 metres from the coach. It is understood the coach driver pulled over on to the hard shoulder of the motorway of his own volition.
A megabus.com spokesman thanked passengers this afternoon for their patience and understanding following the incident;