From the minute the explosion occurred, we definitely knew it was the Syrian regime. These were the kind of attacks they carried out when they controlled Lebanon in the 1980s.This is a country that has chosen sides in its neighbour's conflict.A week before, it was a Shia neighbourhood that was hit by a huge explosion just 100m from the headquarters of the powerful Shia militia, Hezbollah. Their fighters are battling alongside President Assad's soldiers. Some 27 people died in that attack. Again, many more were injured.