The Al-Quds Brigades announced that "the martyr was elevated during a mission to perform his jihad duty." He was working with explosives, no doubt for peaceful purposes.
This comes right after a similar explosion killed two Islamic Jihad members yesterday.
By my tally, this makes 21 Palestinian Arabs killed by terrorist internal explosions and rockets in 2014. Which is slightly more than the amount of Arabs confirmed killed by Israeli forces this year.*
My old graphic about "work accidents" seems quaint in light of how often they have happened recently.
*I am not counting the two "Nakba Day" casualties as I see no evidence that Israeli forces used live fire.