Sunrise Propane blast spark still a mystery

The deadly 2008 explosion and fire at Sunrise Propane in Torontowas traced to a gas hose leak andan accidental"mechanical failure," but the exactignition cause may never be known, saysa confidential report by the Ontario Fire Marshal's Office, obtained by CBC News.

The initial blast and subsequent explosions at the propane fuel sitein the city's north end in the early morningof Aug. 10, 2008,could be heard seven kilometres away. It damaged homes, businesses and schools in the surrounding area.

An employee of Sunrise Propane,Parminder Singh Saini, 25, died in the explosion.

Thereportsaysan illegal "tank-to-tank transfer was in progress at the time of the accident" anda propane leak resulted from a hose failure.

Aboutsix minutes before the explosion, the leaked liquid propane turned to vapour, the report says. Thatvapour cloud ignited, buttheinvestigators said they don't know the exact cause.

"This explosion and fire will be classified as accidental mechanical failure," the report concludes.

The report notes thattank-to-tank or truck-to-truck transfers are both highly dangerous and illegal in Ontario. Sunrise had already been warned about the practice previously.

The report has severalsections blacked out, including information on witnesses and damage to homes.

The report does make recommendations calling for improved standards for equipment and employees. Another recommendation says consideration should be given to how much propane is stored at specific sites, saying the Sunrise site was too congested.

Finally, the report says even though Sunrise did fitstandard site criteria, more consideration should have beengiven towhether its locationso close to a residential area was appropriate.

There is a major class-action lawsuit underway against Sunrise Propane and the owners of the site.