"The clip [shown at the Ma'ariv link] apparently shows a meeting in Abu-Mazen's [President Mahmoud Abbas] bureau in Gaza in which members of the preventive security force identified with [Fatah strongman in Gaza] Muhammad Dahlan participated. When meeting the older gentleman dressed in black uniform, Abu Mazen asks him "are you the head of the preventive security force." When the answer is in the affirmative Abu-Mazen says one word, "slaughter [them]"" (thanks David)