Ma'an (Arabic) reports that a Hamas terrorist was killed when the tunnel he was helping to build collapsed.
The tunnel was in Beit Hanoun, by the Gaza border with Israel.
There have been other terror tunnels built in the area - in 2004, PalArab terrorists killed an Israeli after digging a tunnel under the Erez industrial zone.
So far, no English-language news source has reported this.
The 2007 PalArab self-death count is now at 532.
UPDATE: A "work accident" in Rafah as an RPG accidentally gets fired and kills a 20-year old Hamas terrorist. 533.