Arabs burying bombs in populated areas

Remember when Israel first mentioned the possibility that the Gaza family had been killed by a Hamas bomb buried on the beach? Pro-terror Hamas supporters scoffed that Hamas would never do something like that - bury explosives in areas that Palestinian Arab children might play.

Thanks to the AP photographers/terrorist groupies, we see that perhaps they would:

Palestinian militants set up an explosive device into a mount of sand in preparation for a possible Israeli army ground operation at the Jebaliy refugee camp in the northern Gaza Strip Tuesday June 27, 2006.

By the way, why are there still refugee camps in Gaza? I thought it was the Israeli government that kept Palestinian Arabs in camps....