Police have opened investigation papers into the red shirt anti-Bersih group.

According to a Dang Wangi district police headquarters spokesperson, the group will be investigated under Section 9(5) of the Peaceful Assembly Act on their gathering at Sogo on Tuesday.

"At 3pm police will call the organiser and participants to record their statements at Dang Wangi," the spokesperson told the media over WhatsApp.

Led by Sungai Besar Umno chief Jamal Md Yunos, the group gathered outside the Sogo complex several times to protest against this weekend's Bersih 4 rally.

Tuesday's gathering gained significant attention after a video of participants going into a "trance" while being beaten by sticks went viral.

Jamal has said the red shirts will now train with parangs as a follow- up to the performance involving sticks.

Inspector-general of police Khalid Abu Bakar said this was criminal intimidation and would not be tolerated.

[More to follow]