In the US it is illegal/against code to have a filled propane tank inside a public building. Even small tanks must be stored outside. I can’t imaging any country, even Russia, allowing indoor propane storage in a shopping mall.
Those 3 explosions were pretty widely and evenly spaced. Maybe 3 large spaces/stores that had filled with natural gas from a leak?
https://freerepublic.com/focus/f-bloggers/4115053/posts?q=1&;page=63#54
ETCM: Those 3 explosions were pretty widely and evenly spaced.
Also, they were almost perfectly timed...not random secondary explosions.
The spacing and timing of the explosions lead me to believe they were perfectly executed sabotage.
Start a large fire, which would start the cameras rolling. Then set off the explosions, perfectly timed and perfectly spaced.