A police officer was shot dead in Bangkok Thursday during clashes between security forces and anti-government protesters, according to the hospital where he was taken for treatment.
"He was shot in his chest and brought to hospital by helicopter," said Jongjet Aoajenpong, director of the Police General Hospital. "A team of doctors tried to resuscitate him for more than half an hour."
Violence broke out as demonstrators tried to force their way into a sports stadium in the Thai capital, where representatives of about 30 political parties were gathered to register for February elections.
Thailand's election commission urged the government to postpone February polls after the policeman died and dozens of people wounded in clashes between security forces and opposition protesters in Bangkok.
Nearly 100 people from both sides were injured, according to the emergency services.
Twenty-five police officers were hospitalized, with 10 in serious condition, according to a police spokesman.
The violence deepened the crisis facing Prime Minister Yingluck Shinawatra, whose government has been shaken by weeks of mass street rallies seeking to curb her family's political dominance.
The political conflict broadly pits a Bangkok-based middle class and elite against rural and working-class voters loyal to Yingluck's older brother Thaksin Shinawatra, who was ousted as premier in a military coup in 2006.
The protesters — who want to overthrow Yingluck's government and install an unelected "people's council" in its place — accuse the billionaire tycoon-turned-politician of corruption and say he controls his sister's government from his base in Dubai.
As the violence escalated, the Election Commission held a news conference to recommend the February polls be delayed indefinitely.
"We cannot organize free and fair elections under the constitution in the current circumstances," said commission member Prawit Rattanapien, who along with other vote officials had to be evacuated from the stadium by helicopter.
The main opposition Democrat Party — which has not won an elected majority in about two decades — has vowed to boycott the February election.
There was no immediate response from the government. Under the constitution, an election should normally be held no more than 60 days after the dissolution of parliament, which happened in early December.
Thailand has seen several bouts of political turmoil since Thaksin's overthrow.
His supporters have accused the protesters of trying to incite the military to seize power again, in a country which has seen 18 successful or attempted coups since 1932.
Those wounded Thursday included one protester who was reported in serious condition with an apparent gunshot wound to his head.
Security forces denied firing live rounds, saying only rubber bullets and tear gas were used against demonstrators.
"Protesters are not peaceful and unarmed as they claimed," Deputy Prime Minister Surapong Tovichakchaikul said in a televised address.
"They are intimidating officials and trespassing in government buildings."
The weeks-long unrest, which has drawn tens of thousands of protesters onto the streets, has left six people dead and nearly 400 wounded.
It is the worst civil strife since 2010, when more than 90 civilians were killed in a bloody military crackdown on opposition protests against the previous government.
The demonstrators have vowed to keep up their campaign to disrupt the polls, with protest leader Suthep Thaugsuban threatening to "shut down the country" to prevent people voting.
Pro-Thaksin parties have won every election since 2001, most recently with a landslide victory under Yingluck two years ago.
Thaksin is adored among rural communities and the working class, particularly in the north and northeast. But he is reviled by the elite, the Bangkok middle class and many southerners, who see him as corrupt.
The protesters want loosely-defined reforms — such as an end to alleged "vote buying" — before new elections are held in around a year to 18 months.
The rallies were triggered by a controversial amnesty bill, since abandoned by the ruling party, which Thaksin's opponents feared would have allowed his return without going to jail for a corruption conviction which he says is politically motivated.
The National Anti-Corruption Commission said Thursday that it would press abuse of power charges against the speakers of the upper and lower houses of parliament in relation to another controversial proposed law — blocked by the Constitutional Court in November — to amend the make-up of the Senate.
The anti-graft body said it was still considering whether to press the same charge against 381 other politicians, including Yingluck, who supported the bill.