(CNN) Two commercial planes collided on the ground Friday night at Toronto Pearson International Airport, sparking a small fire and prompting the evacuation of dozens of passengers, the city's airport authority said.

A Sunwing Airlines aircraft backed out while being towed, striking a WestJet Airlines plane that had arrived from Cancun, Mexico, and was waiting to proceed to a gate, officials said.

There were 168 passengers and six crew members aboard the arriving airplane, according to Lauren Stewart, a WestJet spokeswoman.

No passengers or crew members were aboard the Sunwing aircraft, the airline tweeted . A "ground handling service provider," was towing the plane, it said.

Fire trucks and ambulances descended on the tarmac when a small fire on the Sunwing aircraft began, said Beverly MacDonald, a spokeswoman with the Greater Toronto Airports Authority.

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