COLOMBO (AFP) - Sri Lanka freed an opposition Muslim political leader from jail without charge after detaining him earlier in the week under a tough anti-terrorism law, his lawyer said on Saturday.

Mr Azath Sally, 49, the former deputy mayor of Colombo, was arrested on Sunday and detained in police custody in what the minority Muslim community described as the latest attack on them in the Buddhist-dominated island nation.

Mr Sally, leader of the Muslim National Unity Alliance, was released on Friday after authorities revoked a 90-day detention ordered by President Mahinda Rajapakse, who is also the minister of defence, his lawyer Shiraz Noordeen said.

"No charges have been pressed and he was released after negotiations with the defence ministry," lawyer Noordeen told AFP.

A vocal critic of President Rajapakse, Mr Sally is now in hospital following a hunger strike he launched in protest over his arrest under the Prevention of Terrorism Act.

The United States, which moved a censure motion against Sri Lanka at the March United Nations Human Rights Council sessions in Geneva, earlier asked Colombo to ensure the opposition leader had access to lawyers.

Local media reports quoted unnamed officials as saying Mr Sally was accused of inciting Muslims to take up arms against the state - a claim his lawyer denied.

Police did not comment on the politician's release, but the state-run Daily News paper said he had requested a "pardon" from President Rajapakse.

Mr Sally had blamed authorities for turning a blind eye to an anti-Muslim campaign that culminated in an arson attack on two Muslim-owned businesses - a clothing store and a vehicle yard - in March.

Three Buddhist monks and 14 other Buddhists arrested over the attacks were later freed after the police and the victims did not press charges.

Last week, London-based Amnesty International accused Sri Lanka of instilling a climate of fear by stepping up repression and clamping down on dissent - a charge denied by Colombo as a "fascinating piece of fiction".