Trained by Mubarak’s security services, and led by the Palestinian Judas Dahlan:
About 500 Fatah loyalists have returned to Gaza from police training in Egypt amid fighting with rival faction Hamas.
The latest violence killed 14 people, including eight in one attack on Fatah – the worst in three days of bloodshed.
The force is reported to be under the command of Muhammad Dahlan, national security adviser to Mr Abbas, who also leads Fatah.