Wong Tai Sin garage blast 'started when passer-by stopped to light cigarette'
Police sources believe Wong Tai Sin explosion caused by a pedestrian lighting cigarette and igniting fumes from the damaged vehicle

The dramatic explosion that killed three people on Sunday is suspected to have been triggered by a pedestrian who tried to light a cigarette outside the garage, according to police sources.
An investigation found that a middle-aged man moved to light a cigarette seconds before a series of explosions rocked the garage in Wong Tai Sin, one police source said.
"We suspect gas leaked from an LPG taxi in the garage and the lighter caused a spark that set off the blast," he said.
The man was among nine people who were injured in the incident.
"He was injured in the back of the head and was discharged from hospital after treatment," the source said, adding that police were still looking for him.