Media playback is unsupported on your device Media caption The BBC's Jonathan Head: "The Reds say they will oppose any undemocratic moves against the government"

Leaders of Thailand's pro-government movement have warned that any attempt to oust Prime Minister Yingluck Shinawatra could trigger a civil war.

They issued the warning at a rally outside Bangkok - the first staged by the "red shirt" movement near the capital since violent clashes broke out in November.

Opponents of Ms Yingluck and her party have filed legal cases against her.

Months of anti-government mass protests have failed to unseat her.

Image copyright Reuters Image caption Protesters show their Thai identity cards after opposition claims that rally organisers paid migrants to attend

Image copyright Reuters Image caption The PM's supporters say they are holding the rally to deter her opponents from attempts to oust her

Speaking to a crowd of tens of thousands, Jatuporn Promphan, the chairman of the pro-government United Front for Democracy Against Dictatorship (UDD), said judicial institutions were trying "to take over power without elections".

"What we are most concerned about - that we want to warn all sides against - is a civil war, which we do not want to happen," he said.

"It will happen if there is a coup and democracy is stolen."

Acute anxiety

Ms Yingluck is facing mounting legal cases - including charges of neglect of duty and abuse of power - that correspondents say could see her removed from office in coming weeks.

Meanwhile anti-government protesters have continued their own demonstrations from their headquarters in Bangkok's central Lumpini Park.

The government called an election in February, but that was obstructed by protesters.

Since then Thailand has been in a state of paralysis, reports the BBC's Jonathan Head in Bangkok.

Ms Yingluck's party has won the last five elections, but her opponents argue that Thailand's democracy is so deeply flawed that it must be reformed before another election can be held.

Another factor driving the conflict is acute anxiety over the ailing health of King Bhumibol Adulyadej, our correspondent adds.

The red shirts at Saturday's rally openly showed support for his son Crown Prince Vajiralongkorn. He is the designated heir but some among the traditional elite are believed to oppose him.