Yesterday, there was a procession of several thousand people commemorating the death of some martyr back in the year 799. We Muslims are big on that sort of thing. Anyway, some mortar rounds went off, there were a couple of small explosions, and rumors of a suicide bomber in their midst spread through the crowd.
As a result, panic broke out among the marchers just as they were crossing a bridge. In the ensuing melee, as many as a thousand people were killed as they plunged into the river below.
Thankfully, the dead were all Shiites.