( CNN ) -- Canadian authorities are investigating reports that debris fell Monday from a troubled airliner and caused damage to vehicles in southern Ontario . The incident centers on Air Canada Flight 001 , which took off from Toronto at 2:10 p.m . ET , destined for Tokyo 's Narita Airport , with 318 passengers and 16 crew members aboard . One of the Boeing 777 aircraft 's engines shut down after takeoff , prompting the flight crew to follow `` standard procedure '' and return to Toronto Pearson International Airport , said Air Canada spokesman Peter Fitzpatrick . The crew requested an emergency landing , which Fitzpatrick said was standard because it gives certain planes first priority , though he also noted the aircraft involved is designed to run on a single engine if necessary . The plane landed normally , and passengers returned to the gate , according to Fitzpatrick . Constable George Tudos , spokesman for police in the regional municipality of Peel , said the aircraft returned to Toronto 's airport at 3:53 p.m . Yet more than an hour before that , around 2:30 p.m. , people began reporting seeing smoke , and one spotted what may have been debris coming from a large airliner , according to the spokesman . Peel Regional Police ended up receiving several calls from people reporting vehicles had been damaged by things that plunged from the sky , said Tudos . As of about 4:30 p.m. , three to five such vehicles were being investigated for damage . Sarabjit Sandhu told CNN affiliate CP24 that she and her husband had just gotten gas at a Petro-Canada station in Mississauga when they `` heard a big noise , a bump , like boom . '' `` The first thing I said ( was ) , 'Oh my God , what is this ? ' `` Sandhu said . A number of vehicles around the parking lot were damaged , including a Nissan Altima with its back window shattered to pieces while its owner was inside the gas station 's convenience store . Pieces of gray , heavy material littered the scene , according to CP24 . `` It was so hot you could n't even touch it , '' Sandhu said of the material . No injuries have been reported on the plane or on the ground , added the spokesman . Fitzpatrick , the Air Canada spokesman , noted around 5 p.m. that there had been `` no confirmation at this time '' that debris had fallen from his company 's plane . `` There will be a full investigation into this incident , as there always is , and that will determine what happened , '' said Fitzpatrick . Tudos , the Peel police spokesman , said officials from the national transportation agency Transport Canada are investigating . `` Transport Canada will follow up with the company to ensure compliance with safety regulations , '' agency spokesman Kelly James told CNN on Monday by e-mail . `` The department will not hesitate to take immediate action if safety issues are identified . '' CNN 's Aaron Cooper , Todd Sperry and Jake Carpenter contributed to this report .
NEW : A woman whose car was hit says the debris was `` so hot you could n't even touch it '' Police note witness reports of smoke and possible debris coming off of an airplane . Several vehicles were damaged by mysterious debris seemingly from the sky , police say . An Air Canada spokesman says there 's `` no confirmation '' yet anything came from its plane .