Abbas appoints Dahlan as top security adviser

Palestinian Authority Chairman Mahmoud Abbas on Sunday named Gaza strongman Mohammed Dahlan as his national security adviser, presidential aides said. The appointment puts Dahlan, a top official in Abbas's Fatah party, in a sensitive position as Palestinian leaders try to reform their myriad and competing security services. As Gaza security chief in the 1990s, Dahlan led a crackdown on Hamas operatives. Hamas still has rocky relations with Dahlan.