Nepali police are investing whether a bomb threat that delayed a Dubai-bound flight on Sunday was an April Fool’s Day hoax. The Nepal Airlines flight was grounded at Kathmandu International Airport for more than three hours after authorities were warned there was a bomb on board, Associated Press reported. No bomb was found and the plane took off and landed safely in Dubai. Kathmandu airport police chief Narayan Prasad Bastakoti said it is investing whether the threat, which originated in Malaysia, was an April Fool’s Day hoax.