a 12-year-old israeli girl is missing after a tour boat she was on exploded and caught fire off thailand 's southwestern coast on its way to phuket .
the youngster was thought to have been in the toilet on board the ao nang princess 5 ferry which was carrying more than 100 people , including many foreign tourists , when the incident happened .
passengers and crew had to be rescued by a dozen fishing trawlers , speed boats and rescue craft .
the associated press reported that the 12-year-old girl may have been picked up by another boat that was going to the beach resort of phuket .