There are finally some answers--albeit, unsettling ones--to questions surrounding the 2008 Sunrise Propane blast.

According to a report by the Ontario Fire Marshal's Office, the Sunrise Propane explosion that killed two people in two years ago was caused by a prohibited tank-to-tank transfer.

The accidental explosion occurred when liquid propane leaked from a hose during the transfer. The report states that the leaked liquid had vapourized about six minutes before the explosion, though the cause of the ignition is still unknown.

According to the report, Sunrise Propane did not have the appropriate license for conducting tank-to-tank transfers.

Thousands of residents and businesses in the area were affected by the blast. A class-action lawsuit against Sunrise Propane is already underway.