Harbour Air flights operating out of Vancouver and Vancouver Island, B.C. are back in the air after being grounded by a bomb threat earlier in the day.

Police searched the airline's seaplanes in Vancouver, Victoria, Langley and Richmond after the threat was received Wednesday morning.

There were no reports of any bomb being found.

The planes were grounded while police searched for a possible explosive.

The company received a threat at a reservation office, and planes in all four locations were grounded until Transport Canada gives the all-clear.

About 60 planes and hundreds of passengers were affected, Randy Wright, a senior vice president with the airline told The Canadian Press.

Langley Senior Secondary school, which is located near the Langley Airport, was also locked down "because it was directly across the street from the airport, it was simply a precaution," said Langley RCMP Corporal Peter Thiessen.

Traffic was rerouted from the area.

Thiessen told CTV.ca that Langley police were acting on information from the Vancouver Police Department.

George Miller, manager of Langley Airport, told CTV Newsnet that police searched a single seaplane belonging to Harbour Air, but turned up no evidence of explosives there.

Miller said Harbour Air Seaplanes' main office called the Langley branch to report the threat at about 7:30 a.m. local time.

With files from The Canadian Press