Since I tend to follow these things fairly closely, allow me to comment:
It's very very very unlikely that the leg shown is that of a victim. The explosion, which is generally in the abdominal area of the attacker, basically rips their midsection to pieces, leaving limbs and occasionally a nice head rolling down the road (true story, many times over). However, the attacker hardly ever gets close enough to an innocent to actually blow their body apart - this is why most suicide bombers wrap the explosives in nails and the like - the shrapnel does the killing, not the explosion. There are, of course, cases where the explosion itself will cause a fatality other than the bomber, but these are the exception, not the rule.
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