Stockholm ? Canadian police are investigating whether a phoned-in hoax caused a Pakistani jet to be diverted to Stockholm for several hours Saturday for fear that one of its passengers was carrying explosives.

Police evacuated 273 people from the jet, and briefly detained a Canadian man, after an anonymous caller in Canada tipped-off authorities that the suspect was carrying explosives.

However, no explosives were found on the man, who was released after questioning by police, or on the Boeing 777 from Pakistan International Airlines, which had been bound from Toronto to Karachi, Pakistan. The Royal Canadian Mounted Police said it was investigating whether the incident was a “terrorism hoax.”