The anti-government protesters have blocked key Bangkok intersections with tents, tyres and sandbags, seeking to unseat Yingluck and halt the influence of her billionaire brother, Thaksin Shinawatra, an ousted former premier regarded by many as the real power behind the government.

This week they targeted businesses linked, or once linked, to the Shinawatra family, sending stock prices tumbling.

"What we don't like right now is their involvement in threatening companies on the stock exchange that is not involved with government," Tida Tawornseth, chairwoman of the United Front for Democracy against Dictatorship (UDD), said.

The protests have already taken a toll on the economy, on tourism in particular, with arrivals in Bangkok sharply down.

The UDD, a "red-shirted" protest movement based largely in Thailand's populous north and northeast, is holding a meeting of its leaders from across the country on Sunday in Nakhon Ratchasima, north of the capital.

Generous subsidies for farmers in the north and northeast were a centrepiece of the platform that swept Yingluck to power in 2011, but they have left Thailand with vast stockpiles of rice and a bill it is struggling to fund.


About 500 anti-Thaksin protesters gathered this week outside the Bangkok offices of SC Asset Corp SC.BK, a property developer controlled by the Shinawatra family, waving Thai flags and blowing whistles.

Yingluck was executive chairwoman of the company before being swept to power in a landslide election victory in 2011.

SC Asset's share price has lost almost 10 percent since Wednesday and mobile handset distributor M-Link Asia Corp MLINK.BK, also with links to the family, lost 12 percent.

Other stocks affected include telecoms group Shin Corp, founded by Thaksin before he entered politics, and its mobile affiliate Advanced Info Service Pcl (AIS), which on Saturday sent an SMS to clients saying it no longer has any connection with the Shinawatra family.

Tawornseth said Sunday's rally would consolidate plans to restore democracy after the opposition boycotted and disrupted elections this month, leaving the country paralyzed under a caretaker government. She ruled out any plans for violence.

"If we wanted to clash, we would have done so a long time ago. We wouldn't have to wait for this long," she said.

Four protesters and a police officer were killed on Tuesday when police attempted to reclaim protest sites near government buildings. Six people were wounded by a grenade on Friday.

The protests are the latest installment of an eight-year political battle broadly pitting the Bangkok middle class and royalist establishment against the mostly rural supporters of Yingluck and Thaksin.

Demonstrators accuse Thaksin of nepotism and corruption and say that, prior to being toppled by the army in 2006, he used taxpayers' money for populist subsidies such as the rice scheme and easy loans that bought him the loyalty of millions.


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