WestJet flight 142 from Vancouver to Ottawa was diverted to Thunder Bay, Ont., Wednesday night after RCMP received information about a "possible explosive" on board, Thunder Bay police say.

WestJet said the plane landed safely in Thunder Bay, and that authorities deemed the threat "non-specific and non-credible."

The Boeing 737 plane left Vancouver at 4:25 p.m. PT and landed in Thunder Bay about three hours later, sometime between 10:30 and 11 p.m. ET, according to police and the flight-tracking website FlightAware.

Upon landing, the plane was parked in a secure area of the Thunder Bay airport. All 125 passengers and crew members were safely escorted off the plane, which will be searched Thursday, police said.

'Have to be treated seriously'

The Thunder Bay Police Service is handling the investigation, which will include interviews with passengers and crew.

Chris Adams, an executive officer with the force, said in an interview Thursday morning that Ontario Provincial Police are conducting the search of the plane, and that Thunder Bay police were first notified of the situation by RCMP.

"The majority of these are unproven threats and unfounded," Adams said, "but they all have to be treated seriously and all according to what the risk assessment is, and that's exactly what we did here."

Calls to Transport Canada were not immediately returned.