Almost 150 passengers on board a Korean Airlines Boeing 777 were diverted from their route Tuesday amid concerns that an explosive might be on board.

Korean Airlines says a bomb threat was called in shortly after the plane took off from the Vancouver International Airport in British Columbia.

NORAD sent two F-15 fighters from Portland, Ore. to intercept the plane soon after the threat was called in. The fighters escorted the plane to the Canadian Forces Base Comox, where the 149 passengers and the flight crew disembarked. They were sent to a secure location while the plane was searched.

A spokesman with the Royal Canadian Mounted Police says the plane is still being searched Wednesday morning.

The same Korean Air flight was the subject of a similar bomb threat Monday, but was cleared for take-off after a two-hour search.

The plane was en route to Seoul Tuesday before it was grounded. An airline spokeswoman says passengers and crew will be given a new departure time.