Hamas appears to have taken control of nearly the entire Gaza Strip as its battle with rival Palestinian faction Fatah continues to escalate. At least 21 people were killed in internal violence Wednesday, bringing this week’s toll to 80. Hamas forces continue to seize key Fatah positions in Gaza. Earlier today gunmen took control of the headquarters of the Preventive Security forces. Witnesses say Fatah guards were pulled from the compound and executed in the street. Palestinian President Mahmoud Abbas has for the first time ordered members of his elite guard to strike back.