Bangkok - Thailand's embattled government faces a key court ruling on Friday on whether it can go ahead with a fiercely disputed election despite threats by opposition protesters to block the vote.
Prime Minister Yingluck Shinawatra is under intense pressure to step down after nearly three months of street rallies aimed at ousting her elected government and installing an unelected "people's council".
The kingdom has been periodically rocked by political bloodshed since her older brother, former prime minister Thaksin Shinawatra, was overthrown by royalist generals in a coup more than seven years ago.
The main opposition party is boycotting the 2 February election while protesters have vowed to disrupt voting, saying reforms are needed to tackle corruption and vote-buying before polls are held in around a year to 18 months.
Protest leader Suthep Thaugsuban threatened on Thursday to "close every route" to polling stations, saying the election would not be allowed to take place.
Some constituencies have no candidates because demonstrators blocked registrations, so even if Yingluck's party wins it may not have enough MPs to appoint a government.
The Constitutional Court is due to consider a plea from the Election Commission to postpone the polls, a move that could leave the kingdom in protracted political limbo.
The judges have also been asked to rule on whether the power to delay the election lies with the commission or the government, which has insisted that the vote should proceed.
The same court dealt a major setback to the government in November when it ruled that a ruling party bid to make the upper house of parliament fully elected was in breach of the constitution.
Dozens of Yingluck's MPs face a possible five-year ban from politics over that failed bill.
"The status of the Constitutional Court is very controversial", said Sunai Phasuk, a senior researcher with New York-based Human Rights Watch.
"It is a product of a coup in 2006 and acts mainly as a tribunal not a court of justice per se", he said, noting that the government had been "badly crippled" by its rulings.
The demonstrators have staged a self-styled "shutdown" of Bangkok since 13 January, erecting roadblocks and rally stages at several main intersections including in the main hotel and shopping districts, although attendance has gradually fallen since last week.
Nine people have been killed and hundreds injured in grenade attacks, drive-by shootings and street clashes since the protests began at the end of October.
The government on Tuesday declared a 60-day state of emergency in Bangkok and surrounding areas to deal with the unrest.
The decree gives the authorities the power to ban public gatherings of more than five people, prohibit protesters using certain routes and forbid media spreading misinformation.
But the government has not yet used any of those measures, and has ruled out using force to end the rallies.
When a state of emergency was last imposed in 2010 during pro-Thaksin protests, the previous government cracked down with armoured vehicles and soldiers firing live rounds. More than 90 people were killed and nearly 1 900 injured.
The military, traditionally a staunch supporter of the anti-Thaksin establishment, has said it wants to remain neutral during the current standoff, although the army chief has refused to rule out another coup to seize power from Yingluck.