PKR vice-president Rafizi Ramli was arrested today after presenting himself at the Kuala Lumpur police headquarters after being summoned by the police.

He was held under Section 143 of the Penal Code for being a member of an unlawful assembly, according to Rafizi's Facebook posting.

Meanwhile, the police have unsuccessfully sought to detain former Bar Council chairperson Ambiga Sreenevasan longer than the 24 hours they are allowed by law to hold her.

A remand hearing was held at the Jinjang police detention centre where the magistrate ordered the police to immediately release Ambiga, DAP national organising secretary Anthony Loke and PSM secretary-general Arutchelvan.

Loke and Arutchelvan were detained overnight at the detention centre while Ambiga was held overnight at the Dang Wangi district police headquarters.

The trio were arrested last night for their involvement in yesterday's anti-GST protest.

A team of lawyers entered the detention centre around 11.10am for the hearing while Ambiga arrived in a police van at about 11.50am.

She appeared in good spirits, smiling and waving at the media as the vehicle entered the detention centre.

Also spotted in the vehicle is PAS central committee member Hatta Ramli who surrendered earlier today, on police request. He, too, was released later.

'Protest was peaceful'

Meanwhile, some 40 supporters have gathered outside the Jinjang detention to show support and cheered when Ambiga and Hatta arrived.

Speaking to journalists outside the detention centre later, PSM treasurer A Sivarajan said the anti-GST protest yesterday was peaceful. 

He said a smoke bomb going off at the rally was an isolated incident and should not be used as an excuse to crack down on the organisers.

"The protest was peaceful, with more than 10,000 people. None of the people got hurt and none made any police reports.

"This sporadic event (smoke bomb) is anyone's guess. If police said so, then catch that person... for us, it was very peaceful and we finished, we dispersed," he said.