( AP ) - Hamas fighters overran Fatah-allied Preventive Security headquarters in Gaza City on Thursday, a key target in their battle to control the entire Gaza Strip, witnesses and a security agency official said.
One witness, Jihad Abu Ayad, said Hamas gunmen were bringing Preventive Security men out of the building and executing them in the street.
This is a breaking news update. Check back soon for further information. AP's earlier story is below.
Palestinian President Mahmoud Abbas for the first time Thursday ordered his elite presidential guard to strike back against Hamas militants bent on besieging his Gaza City compound.
Previously, Abbas of Fatah had told the guard to maintain a defensive posture at his house and office in Gaza.
Abbas was in the West Bank town of Ramallah when he handed down the order.