Fire was spotted on a plane of Shenzhen Airlines on Sunday before it took off at Shenzhen airport that serves China\'s first special economic zone, according to the company. Twelve passengers boarding on the ZH9969 flight suffered minor injuries while being evacuated, company sources said. An investigation into the flight fire, which occurred at around 6:10 p.m., is under way. The incident did not disrupt the flight schedules of Shenzhen Bao\'an International Airport.