Anti-government demonstrators swarmed polling stations in Thailand's capital today and chained their doors shut, blocking voters from casting advance ballots ahead of general elections scheduled for next week.
The chaos was the latest blow to prime minister Yingluck Shinawatra's embattled government, which called the February 2 vote in a failed bid to ease months of street protests that have thrown the nation into crisis.
The outcome of today's balloting is seen as a harbinger for the main poll, which the election commission and protesters demanding that Ms Yingluck be ousted want postponed.
Although disruptions are expected at up to 50 electoral venues in Bangkok and the opposition stronghold in southern Thailand, voting today is likely to go ahead unhindered in the majority of the country.
About 49 million of Thailand's 64 million people are eligible to cast ballots, and 2.16 million of them applied for advance voting.
Protesters waving the Thai flag blocked electoral officials and ballot boxes from getting inside voting stations, and several were closed as a result.
Police took no action to disperse the crowds, following long-standing orders from Ms Yingluck to avert violence for fear of triggering a military coup that could depose her government.
Suthida Sungkhapunthu, a 28-year-old office worker, turned back from one polling station after reading news of the day's mayhem on her phone.
"I saw this coming but I'm still quite disappointed," she said, denouncing the protesters as "undemocratic" as she watched the mob at her polling station.
"It's my constitutional right" to vote.
The protesters, led by Suthep Thaugsuban, are pushing for Ms Yingluck's government to be replaced by a non-elected 'people's council' that would implement anti-corruption reforms before a new vote can take place.
They accuse the government of carrying on the practices of her billionaire brother Thaksin Shinawatra, a former prime minister they allege used the family fortune and state funds to influence voters and subvert democracy.
He was ousted in a military coup in 2006 after street protests accusing him of corruption and abuse of power.
The coup triggered a sometimes-violent and still active struggle for power between his supporters and opponents. He fled into exile in 2008 to avoid a two-year prison sentence for a conflict of interest.
Ms Yingluck has faced months of street protests, which intensified this month with demonstrators trying to shut down government offices to prevent civil servants from working.
There are increasing doubts the February 2 poll will take place, and the ruling party suggested over the weekend that it was willing to postpone it - but only if protests end and the main opposition party abandons its boycott.
There has been no sign yet that Ms Yingluck's rivals would agree, although she the election commission are expected to meet on Tuesday to discuss a possible delay.
Even if the February 2 vote goes ahead, the crisis will continue. Protesters blocked registration in some districts last month, and not all legislative seats will be filled.
Parliament is therefore unlikely to achieve the quorum it needs to convene, which would prevent a new government from being formed.
On Friday, the constitutional court ruled that the government, in agreement with the election commission, could postpone the polls.
But Ms Yingluck's Pheu Thai party questioned the legal basis for the ruling.
One official, Thanin Boonsuwan, suggested that the court's ruling did not meet conditions set down by law or precedent.
The government this week imposed a state of emergency in Bangkok and surrounding areas after a spate of protest-related violence.
The measure allows suspension of many civil liberties. The protesters say they will ignore any measures imposed by the decree, which is valid for 60 days.
The Pheu Thai party won the last general vote in a 2011 landslide.