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The resignation of president has been accepted, the crisis-hit country's parliamentary speaker announced on Friday, after he fled the country earlier this week, prompting relief among protesters camped outside his former offices.

The formal declaration makes – once known as "The Terminator" for his ruthless crushing of the Tamil rebellion – the first head of state to resign since it adopted an executive presidency in 1978.

He emailed in his notice from Singapore after flying to the city-state from the Maldives, where he initially escaped after demonstrators overran his palace at the weekend.

"The president has officially resigned from his position," speaker Mahinda Yapa Abeywardana told reporters.

Outside the presidential secretariat, at the makeshift headquarters of a months-long protest movement against Rajapaksa, Catholic priest Jeevantha Peiris told AFP: "This is a historical moment for all Sri Lankans.

"We were assaulted, put in prisons, put on travel bans, some of our friends laid their lives down. With all these hardships we have come through," the 45-year-old said. "We have no fear anymore."

The former president, he added, was a "bloodthirsty criminal" who should return to Sri Lanka to face justice.

Prime Minister Ranil Wickremesinghe was sworn in as acting presidentÌý– his accession was automatic under Sri Lanka's constitution – but many of the demonstrators see him as complicit in the rule of the Rajapaksas and also want him to go.

Parliament will meet on Wednesday to elect an MP to succeed Rajapaksa for the rest of his term, the speaker's office said, with nominations due the previous day.

'Private visit' to Singapore

Rajapaksa's departure came after months of protests over what critics said was his mismanagement of the island nation's economy, leading to severe hardships for its 22 million people.

He, his wife Ioma and their two bodyguards arrived in Singapore from the Maldives on board a Saudia airline flight.

As president, Rajapaksa enjoyed immunity from arrest, and he is understood to have wanted to go abroad before stepping down to avoid the possibility of being detained.

The former Maldivian president Mohamed Nasheed is believed to have played a behind-the-scenes role in getting him out of the country, and said Rajapaksa feared he would be killed if he remained.

"I believe the President would not have resigned if he were still in Sri Lanka, and fearful of losing his life," Nasheed tweeted.

Singapore's foreign ministry confirmed Rajapaksa had been allowed to enter the city-state for a "private visit", adding: "He has not asked for asylum and neither has he been granted any asylum."

He is expected to look to stay in Singapore for some time, according to Sri Lankan security sources, before potentially moving to the United Arab Emirates.

The spiralling economic crisis led to Sri Lanka defaulting on its $51 billion foreign debt in April, and it is in talks with the International Monetary Fund (IMF) for a possible bailout.

But the talks have been thrown off course by the political upheaval, and an IMF spokesman said on Thursday the fund hoped the unrest could be resolved soon so negotiations could resume.

The island has nearly exhausted its already scarce supplies of petrol, with the government ordering the closure of non-essential offices and schools to reduce commuting and save fuel.

Protesters exit

In Colombo, demonstrators on Thursday left several of the emblematic state buildings they had occupied in recent days after Wickremesinghe instructed security forces to restore order and declared a state of emergency.

Witnesses saw dozens of activists leave Wickremesinghe's office as armed police and security forces moved in.

The capital was put under curfew and armoured personnel carriers patrolled some areas.

Hundreds of thousands of people had visited the prime minister's compound since it was opened to the public after he fled and his security guards backed down.

Thousands of people gathered in the capital Colombo on Saturday, to demand the government take responsibility for mismanaging Sri Lanka's finances, and for crippling food and fuel shortages

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By Thursday afternoon, the gates were closed, with armed guards posted both inside and outside.

Police said a soldier and a constable were injured in clashes with protesters outside the national parliament as security forces beat back an attempt to storm the legislature.

Protesters also left the studios of the main state television station after breaking in on Wednesday.

The main hospital in said about 85 people were admitted with injuries on Wednesday, with one man suffocating to death after being tear-gassed at the premier's office.

The military and the police were issued fresh orders Thursday to firmly put down any violence, and warned troublemakers they were "legitimately empowered to exercise their force".

But student Chirath Chathuranga Jayalath, 26, said: "You cannot stop this protest by killing people. They'll shoot our heads but we do this from our hearts."