C-GWJT, a Boeing 737-700 aircraft operated by WestJet, was conducting flight WJA113 from Calgary Intl, AB (CYYC) to Vancouver Intl, BC (CYVR) with 56 passengers and 5 crew members on board. During the initial climb through 10 000 feet after the departure from CYYC, the flight crew received an aft cargo fire warning. The QRH was executed, an emergency was declared and a return to CYYC was requested.
After the landing, ARFF inspected the aft cargo hold and found evidence of fire in a passenger baggage.
The TSB Edmonton office has deployed two investigators to CYYC.