A commander affiliated with Palestinian Authority Chairman Mahmoud Abbas's Fatah movement was shot dead on Sunday, in the most serious attack since Abbas launched a new security plan aimed at calming a wave of violence in the Gaza Strip last week. Fatah quickly blamed militants from the rival Hamas group, with whom it shares power in the Palestinian government. There was no immediate comment from Hamas. The dead man was identified as 32-year-old Baha Abu Jarad of the Al Aksa Martyrs' Brigades. He was shot while driving through the northern Gaza town of Beit Lahiya, and later died of his wounds, hospital officials said.