Sri Lanka said on Tuesday that it would court martial ex-army chief and defeated presidential candidate Sarath Fonseka for conspiring against the government and sacked parliament to make way for snap polls.

NONE President Mahinda Rajapakse dismissed the legislature from midnight Tuesday, two months ahead of schedule, his spokesman Lucien Rajakarunanayake said, adding that it was up to the elections commissioner to announce a polling date.

Official sources said voting is likely to be on April 8 and the new session of the next parliament will be on April 22. A formal announcement is expected from the polls chief after receiving nominations during this month.

NONE The dismissal came hours after the defence ministry said Fonseka, who was seized by troops at his office in Colombo on Monday, will face a court martial even though he quit in November following a rift with the president.

The opposition said Fonseka was "grabbed" by the military while he discussed plans to contest upcoming parliamentary polls with several senior party leaders who had backed his failed bid for the presidency last month.

The government said Fonseka had been "conspiring" with opposition politicians while he was still the army chief.

"The broader charges were that he engaged with political leaders and political parties that were working against the government," defence ministry spokesman Keheliya Rambukwella told reporters.

"He shall be tried and punished for that offence by a court martial."

Asked if Fonseka could be tried for treason, Rambukwella said: "It could be one of the charges."

Coup-plotting claim

Fonseka, 59, the only four-star general in the army, quit after falling out with his commander-in-chief, Rajapakse, whom he later challenged in January presidential elections.

NONE Shortly after the poll, which Rajapakse won comfortably, the government accused Fonseka of plotting a coup to overthrow the president and assassinate his family members.

And earlier this month, Rajapakse sacked a dozen senior military officers described by the defence ministry as a threat to national security. More were arrested from Fonseka's office.

Sri Lanka's former peace facilitator, Norway, joined the UN, France and the US in expressing concern over Fonseka's dramatic arrest and deplored the mounting government pressure on independent journalists and dissidents.

"There is a tremendous need for the government of Sri Lanka to work to overcome the fissures that exist within its society," the US State Department spokesman Philip Crowley told AFP in Washington.

Norway said Fonseka's arrest "will have consequences on the possibility to progress towards lasting political stability" in Sri Lanka while France said it was "extremely worried".

UN spokesman Martin Nesirky said Secretary General Ban Ki-moon "is following developments in Sri Lanka with concern" and urged Colombo authorities "to follow due process of law and provide all necessary protections (for Fonseka) and guarantees to his safety."

Nesirky said Ban planned to speak with President Mahinda Rajapakse "in the coming hours" about the case.

War crimes

The Sri Lankan government is concerned about Fonseka's apparent willingness to testify at any probe into alleged war crimes committed by Sri Lankan troops last year in the final stages of the conflict with Tamil Tiger rebels.

NONE Hours before his arrest, Fonseka had told reporters he was willing to face an international investigation.

"I am not prepared to protect anyone, if they have committed war crimes," Fonseka said.

The government has resisted international calls for a probe, amid charges that a senior defence official ordered the killing of surrendering rebel leaders.

The United Nations says 7,000 civilians died during the final stages of the conflict.

As the battlefield architect of the victory over the Tigers last May, Fonseka had seemingly secured his legacy as the commander who finally crushed their 37-year campaign for an independent Tamil homeland.

But his bid to translate that success into political power proved his undoing.

Fonseka's wife Anoma gave a tearful press briefing Tuesday, saying her husband had been treated "like an animal".

"This is not an arrest. It is an abduction," she said. "What I want to tell the government is: 'Just be reasonable. Treat him like a human being.'"

Opposition leader and former premier Ranil Wickremesinghe said Fonseka's arrest was "a big blow to democracy" in Sri Lanka.

- AFP