A drone crashed into a passenger plane last week in Canada, renewing safety concerns about unmanned aircraft and raising questions about how best to enforce regulations now that drones are becoming more and more commonplace.

The drone hit a plane carrying six passengers and two crew members en route to an airport in Quebec on Thursday.

“This should not have happened,” Canada’s minister of transport, Marc Garneau, said at a news conference on Sunday. “That drone should not have been there.”

Nobody was hurt, but the incident could have caused “catastrophic” damage had it hit an engine or incapacitated the pilot, Mr. Garneau said.