Police last night searched the offices and home of Pandan MP Rafizi Ramli, who was arrested under the Official Secrets Act.

Rafizi was brought along during the search, unrestrained and still wearing the suit he had on when he was detained at the Parliament gates under the Official Secrets Act yesterday.

They first went to the PKR headquarters in Petaling Jaya, where Rafizi was met by party president Dr Wan Azizah Wan Ismail.

Police spent almost half an hour at the premises, and left with documents and one computer.

They then sped off for a quick visit to Rafizi's MP office in Pandan, before searching his apartment in Bukit Antarabangsa.

At the home, police seized one laptop and a phone.

Tired but in good spirits, Rafizi told reporters that his wife and two and-a-half year old son were not at home.

"They know the drill," he said, winking at the camera.

PKR Youth strategic director Akmal Nasir later tweeted that Rafizi would be held overnight at the Jinjang detention centre.

Rafizi was detained under Section 8 of the OSA yesterday after revealing classified documents regarding the Lembaga Tabung Angkatan Tentera (LTAT).

He was arrested when he wanted to leave Parliament to fetch his son from the babysitter.

Hours later opposition MPs and supporters gathered outside Bukit Aman to protest the arrest.

"Why are our leaders who talk about politics, expose corruption, why are they being arrested?" PKR vice-president Shamsul Iskandar Md Akin asked.

Pokok Sena MP Mahfuz Omar, meanwhile, said detaining Rafizi while in Parliament was still in session was an insult to the Agong.

"If police don't release Rafizi to attend the last two days of Parliament, this is an insult to the Agong," Mahfuz said.

The King had officiated at this Parliament session, the first in 2016.

The first half of this session was spent debating his royal address to lawmakers.

Police searched the home and offices of @rafiziramli tonight. They seized a PC, a laptop and a phone. pic.twitter.com/cJHLD3j34O

— Zikri Kamarulzaman (@zikri) April 5, 2016