Gunmen have killed one person and wounded four others in an attack on anti-government protesters. Shots were fired at vehicles carrying demonstrators to their camp in Bangkok after a protest at a government office complex just north of the city.

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Anti-government protesters gather in front of a portrait of their slain comrade in their encampment near the Government House in BangkokReuters

Emergency services said three men and two women were shot and one of the men had died. Ramathibodi Hospital said 52-year-old Wasan Kamwong died from severe injuries to his head.

Prime minister Yingluck Shinawatra Yingluck is facing possible suspension of duties and eventual impeachment over a contentious rice deal. She appeared before the National Anti-Corruption Commission to defend herself.

Yingluck's supporters have vowed to stage a mass rally, raising fears of further clashes with anti-government demonstrators.

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Anti-government protesters take photos of a portrait of their comrade who was killed when gunmen opened fire on a group of protesters driving away from a Bangkok rallyReuters
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Thai government officials pour water onto the hands of two police officers killed by a roadside bomb in Thailand's southern province of NarathiwatAFP
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Gear and weapons of victims are placed by the road as security forces inspect the site of a bomb attack that killed two policemen and wounded three others in the troubled southern province of NarathiwatReuters
Thai Prime Minister Yingluck Shinawatra leaves the National Anti-Corruption Commission office in Nonthaburi province after defending herself against corruption chargesReuters
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Thai riot police stand guard outside the National Anti-Corruption Commission in Nonthaburi province as Prime Minister Yingluck Shinawatra arrives to testifyAFP
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Anti-government protesters shout slogans and wave national flags inside a government complex during a rally in BangkokAFP
Anti-government protesters blow whistles and wave national flags outside a government complex during a rally in BangkokAFP
Government workers look at protesters demonstrating inside their office buildingAFP
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Thai army soldiers secure an area inside a government complex in Bangkok, as protesters blow whistles outsideAFP