The Jerusalem Post says that 28 have been killed in the clashes between Hamas and the Jund Ansar Allah group in Rafah. PCHR says "at least" 28 have been killed.
One cute factoid: the leader of the ultra-radical group, Sheikh Abdel Latif Mousa, was an Egyptian-educated physician and was also an employee of the Health Ministry belonging to the "moderate" PA government.
Bullets and mortars from the fighting reached the Egyptian side of Rafah, and an Egyptian child was hit by a bullet.
By sheer coincidence, a member of the Doghmush family was killed in Gaza City at the same time. Hamas battled that family last year. Hamas claims that they had nothing to do with his death, and that it was a clan clash. For some reason, he was driving a police car when he was offed. Hmmm.
So now the 2009 PalArab self-death count is at 167.
UPDATE: At least four of the dead are under 18.