Protesters in Thailand have forced the closure of several government ministries and vowed to take control of state offices nationwide in a bid to oust Prime Minister Yingluck Shinawatra.

Thousands of protesters struck new targets in Bangkok, emboldened by their takeover of the finance ministry where hundreds of protesters camped overnight.

Demonstrators surrounded the Interior Ministry and then cut electricity and water to pressure people inside to leave.

Security personnel locked themselves and ministry employees behind the gates.

The agriculture, transport, sports and tourism ministries were also surrounded, with officials inside the buildings ordered to leave.

The main protest group converted the Finance Ministry into its headquarters and declared it a "rest day," as protesters erected tents in the car park.

"Tomorrow there will be a nationwide movement," protest spokesman Akanat Promphan told reporters inside the emptied ministry.

He said the aim was to paralyse the government by seizing offices and state agencies so they cannot be "used as a mechanism for the Thaksin regime."

But Red Shirt leader Thida Thavornseth cast doubt on the motives of protest leader Suthep Thaugsuban.

"Suthep is not trying to throw out the government," he said.

"He wants to throw out democracy and replace it with an ultra-royalist administration."

Elsewhere, the opposition Democrat Party - which is spearheading the protests - launched a parliamentary no-confidence debate, although the vote had no chance of unseating Yingluck as her ruling Pheu Thai party controls the House of Representatives.

Yingluck warned that she had no intention of resigning and offered to negotiate with protest leaders.

The Prime Minister has vowed not to use violence to stop the protests but the government expanded special security laws late on Monday to cover the entire capital, extending its scope to cover occupations.

And a court approved an arrest warrant yesterday for protest leader Suthep Thaugsuban in connection with the occupations.