The bus was ambushed by unknown attackers. They shot and killed all of the engineers. Four engineers were from Syria, and the fifth one was an Iranian.
The report of this event came from a Britain-based organization called the Syrian Observatory for Human Rights. A similar event took place last July, when six workers at the same center were attacked by mortar fire.
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Source: http://news.yahoo.com/five-nuclear-engineers-murdered-near-damascus-225907276.html
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Photo Credit: Unchanged; from https://www.flickr.com/photos/gereports/4303310175
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Keywords: nuclear engineers, killed, Syria, Damascus, bus