RAMALLAH, West Bank - Palestinian President Mahmoud Abbas on Saturday declared Hamas' paramilitary militia in the Gaza Strip illegal, raising the stakes in his standoff with the Islamic movement.

Abbas made the announcement two days after members of the Hamas force attacked the home of a senior security commander in Gaza, killing the man and seven of his bodyguards. The man was a member of the Preventive Security force, which is loyal to Abbas' Fatah party.

Abbas' office said the decision was made "in light of continued security chaos and assassinations that got to a number of our fighters ... and in light of the failure of existing agencies and security apparatuses in imposing law and order and protecting the security of the citizens."