Police fired tear gas and rubber bullets on protesters trying to force their way into a sports stadium where candidates were gathering to draw lots for their position on polling papers

Protesters trying to halt preparations for elections fought running battles with police in the Thai capital on Thursday, as the country’s festering political crisis again flared into violence.

Officers fired tear gas and rubber bullets toward protesters trying to force their way into a sports stadium where candidates were gathering to draw lots for their position on polling papers, according to an Associated Press reporter at the scene.

The demonstrators, some armed with sling shots, threw rocks and attempted to break through police lines. Inside the stadium, candidates for at least 27 parties took part in the lot—drawing process, which apparently went on unaffected despite the turmoil outside the gates.

Three officers were injured, said police Col. Anucha Romyanan. He urged the demonstrators to assemble peacefully and said “attempts are being made to escalate the political situation by causing violence.”

It was unclear how many protesters were hurt in the clashes, which were contained to the area around the stadium. It was the first violent incident in nearly two weeks of daily protests on the streets of Bangkok.

The protesters have been demanding that Prime Minister Yingluck Shinawatra step down since mid—October, and street unrest has occasionally broken out. They oppose the polls scheduled for Feb. 2 because Yingluck is seen as sure to win them.

Police have largely shown restraint and have made no move to arrest the ringleader, Suthep Thaugsuban, who is demanding the country be led by an unelected council until reforms can be implemented.

Thailand has been wracked by political conflict since Yingluck’s brother, former Prime Minister Shinawatra, was toppled by a 2006 military coup. The protesters accuse Yingluck of being a proxy for Thaksin, who lives in self—imposed exile to avoid jail time for a corruption conviction but still wields influence in the country.

Thaksin or his allies have won every election since 2001 thanks to strong support in the north and northeast of the country. His supporters say he is disliked by Bangkok’s elite because he has shifted power away from the traditional ruling class, which have strong links to the royal family.

On Wednesday, Yingluck announced a proposal for a national reform council to come up with a compromise to the crisis, but it was rejected by the protesters. They now plan more civil disobedience and street protests in a bid to provoke such chaos that Yingluck will be forced to resign as caretaker.

The country’s main opposition party, which is allied with the protesters, is boycotting the elections, which Yingluck called early in hopes of giving her a fresh mandate and defusing the crisis.

Yingluck led the country for two years relatively smoothly. But in October, her government tried to introduce an amnesty law that would have allowed Thaksin to return to the country as a free man, sparking the latest round of unrest.

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