An Aeromexico plane flying to Mexico City from Paris had to land late Sunday afternoon at Pierre Elliott Trudeau International Airport in Montreal to remove a passenger.
The man, whose identity hasn't been disclosed, was escorted off the plane and taken into custody for questioning by the RCMP. Radio-Canada.ca reported that his name was on the U.S. no-fly list.
All 150 passengers were removed from the Boeing 767, searched and then allowed to reboard.
The plane resumed its flight shortly after 10 p.m. ET, Montreal airport official Marie-Claude Desgagnes said. It was expected to arrive in Mexico City about 3:30 a.m. local time.
The U.S. Transportation Security Administration told the CBC in an email that it knows that Aeromexico Flight 006 was diverted to Montreal "due to a person of interest."
"Officers removed the individual from the flight and arrested the person on an outstanding warrant," spokeswoman Lauren Gaches said in the email.
"The United States' ability to refuse entry into its territory of any flight it deems to present a threat to its security is recognized by numerous countries and is consistent with international agreements," she said without providing further details.
As a matter of policy, the TSA does not confirm or deny whether an individual appears on a government watch list.