Protesters inside the Finance Ministry. They have called for the occupation of other government buildings. Damir Sagolj/Reuters

Protesters rest at the entrance of the Finance Ministry after occupying it. About 1,000 demonstrators forced their way into the building. Damir Sagolj/Reuters

Protest leader and former Deputy Prime Minister Suthep Thaugsuban, center, waves to protesters at the Finance Ministry. Damir Sagolj/Reuters

Police officers confront protesters pushing against a barricade near the Royal Thai Government House in Bangkok. Damir Sagolj/Reuters

Protesters shout as they get ready to attack a police barricade Monday. Damir Sagolj/Reuters

Anti-government protesters are blessed by supporting Thai monks in the grounds of the Thai Foreign Ministry, where they have set up a camp and occupied it. Barbara Walton/EPA

An opposition protester bites a necklace carrying amulets during a rally at the occupied Finance Ministry. Christophe Archambault/AFP/Getty Images

Riot policemen stand guard outside the parliament during a censure debate as Thai Prime Minister Yingluck Shinawatra faces a no-confidence debate. Chaiwat Subprasom/Reuters

Anti-government protesters march toward Thailand's Finance Ministry in Bangkok on Monday, part of an effort to topple the government of Prime Minister Yingluck Shinawatra.

Thailand's massive anti-government protests stretched beyond the capital city of Bangkok on Wednesday, as opposition demonstrators stepped up their attempts to overthrow Prime Minister Yingluck Shinawatra's government.

Demonstrators rallied outside at least a dozen provincial halls in the South, including the tourist island of Phuket.

Tens of thousands of demonstrators have rallied against Yingluck and her brother, ousted premier Thaksin Shinawatra, in the biggest street protests since 2010, when more than 90 civilians were killed in a military crackdown.

After an arrest warrant was issued for protest leader Suthep Thaugsuban, he called for all government offices in all provinces to be occupied.

The rallies in six southern provinces followed Suthep’s call Tuesday night from the Ministry of Finance, which had been occupied by protesters, the Bangkok Post reported.

In the South, demonstrators converged on the main provincial offices in Trang, Phuket, Surat Thani, Chumphon, Songkhla, and Satun. They did not enter the offices.

Meanwhile, in Bangkok, raucous, whistle-blowing crowds continued their siege on government buildings. Up to 10,000 protesters gathered Wednesday at a large office complex on the northern outskirts of Bangkok that houses several key governmental agencies.

Their numbers swelled dramatically as Suthep marched into the compound. "We are very upbeat and I think we will win in a few days," the former deputy premier and key opposition figure told reporters as he left his de facto headquarters at the occupied finance ministry.

"If we demolish the Thaksin regime ... we will set up a people's council which will come from people from every sector," he said. "Then we will let the people's council pick good people to be the prime minister and ministers."