Police swooped down and arrested six protesters at the Pecat IGP sit-in at Dataran Merdeka at 12.15am.
The sit-in had begun on 21 March, and yesterday DBKL warned the activists that they had to vacate the site midnight.
The six arrested, including Simpang Pulai state assembly member Tan Kar Hing and Teja state assembly member Chang Lih Kang, were then brought to the Jinjang police lock-up. A lawyer was with them.
One of the protesters was apparently injured in the incident.
After the police left, the Pecat IGP banner was once again strung up, but police returned at 5.00am to remove it, according to the KitaLawan Facebook page.
Those arrested are expected to be brought to the magistrate at 10.00am for a remand hearing.