Scenes from a video reportedly filmed in secret during the bloody attack on members of the Ahmadiyah sect in Banten on Sunday have begun circulating.

The clip, broadcast on Metro TV, shows police officers offering little resistance to the 1,500 strong crowd, many of whom are armed with bamboo sticks, machetes or rocks.

In another scene prior to the attacks, a plain clothes officer is filmed attempting to persuade a group of 21 Ahmadiyah members guarding a house belonging to Ahmadiyah cleric Ismail Suparman to leave the premises.

He warns that a mob is on the way to the village. When negotiations fail the mob stormed the village, with police failing to even erect a barricade to prevent clashes. "Police get out. Burn these Ahmadiyah people!" one man shouts.

The mob is then filmed attacking the house with rocks as the people inside are forced to flee for their lives. The mob then began to chase down the scattered Ahmadiyah members.

The three people who were killed were identified as Roni, 30, Mulyadi, 30, and Tarno, 25. Five other Ahmadiyah members were severely wounded in the incident.