Palestine Press Agency reports that a member of Islamic Jihad's Al Quds Brigades was blown up, and three others injured, when a minibus exploded in Gaza City near the home of Ismail Haniyeh.
A doctor is speculating that it might have been an Israeli airstrike, but so far it appears to be another of those infamous "work accidents."
Islamic Jihad's Saraya.ps website does not yet have the story. I'll wait for the smoke to clear before adding it to the self-death count.
UPDATE: Smoke cleared enough for me. The explosion occurred in a Volkswagen, and the IDF denied any activity.