Protesters have broken into the Sri Lankan Prime Minister’s private residence and set it on fire, hours after he said he would resign when a new government is formed.

The day of demonstrations also saw crowds storming the President’s home and office.

The office of Prime Minister Ranil Wickremesinghe said the protesters forced their way into his Colombo home on Saturday evening.

It is not immediately clear if he was inside at the time of the attack.

Mr Wickremesinghe’s earlier decision came after the biggest protest yet swept Sri Lanka on Saturday, with tens of thousands of people breaking through barricades and entering President Gotabaya Rajapaksa’s residence and nearby office to vent their fury against a leader they hold responsible for the nation’s worst economic crisis.

In his resignation pledge, Mr Wickremesinghe was responding to a call by leaders of political parties represented in parliament that he and President Gotabaya Rajapaksa should quit, after tens of thousands of people trooped to the capital to vent their fury at the leaders they hold responsible for the nation’s worst economic and political crisis.

He said: “Today in this country we have a fuel crisis, a food shortage, we have the head of the World Food Programme coming here and we have several matters to discuss with the IMF. Therefore, if this government leaves there should be another government.”

But he made it clear he will not step down before a new government is formed, angering crowds that moved near his home to force him to leave office immediately.

Mr Wickremesinghe said he suggested to the President to have an all-party government, but did not say anything about Mr Rajapaksa’s whereabouts. Opposition parties in parliament were currently discussing the formation of a new government.

Mr Rajapaksa appointed Mr Wickremesinghe as prime minister in May in the hope that the career politician would use his diplomacy and contacts to resuscitate a collapsed economy.

But people’s patience wore thin as shortages of fuel, medicine and cooking gas only increased and oil reserves ran dry.

Many protesters accuse Mr Wickremesinghe of trying to save Mr Rajapaksa when he came under pressure to resign and every other member of his powerful political dynasty quit the cabinet.

Privately-owned Sirasa Television reported that at least six of their staff members including four reporters were taken to hospital after they were beaten by police while covering the protest near Mr Wickremesinghe’s home.

Sri Lanka Medical Council, the country’s top professional body, warned that the country’s hospitals were running with minimum resources and will not be able to handle any mass casualties from the unrest.

The association said that the President, Prime Minister and the government would be held responsible if people died or were maimed.

It urged the leaders to heed the cry of the people, resign and hand over the reins to an all-party government.

Earlier on Saturday, the crowds broke into Mr Rajapaksa’s fortified residence. Footage showed people in a jubilant mood taking a dip in the garden pool of the residence.

Some lay on beds, others made tea and drank, and made “statements” from the conference room that Mr Rajapaksa and Mr Wickremesinghe must immediately quit.

It was not clear if Mr Rajapaksa was inside his residence when it was stormed. A government spokesman, Mohan Samaranayake, said he had no information about his movements.

Leaders of political parties in Parliament met later and decided to request Rajapaksa and Wickremesinghe to step down, opposition lawmaker Rauff Hakeem said on Twitter. He said a consensus was reached that the parliamentary speaker should take over as temporary president and work on an interim government.

Sri Lanka’s economy is in a state of collapse, relying on aid from India and other countries as its leaders try to negotiate a bailout with the International Monetary Fund.

The economic meltdown has led to severe shortages of essential items, leaving people struggling to buy food, fuel and other necessities.

The turmoil has led to months of protests, which have nearly dismantled the Rajapaksa political dynasty that has ruled Sri Lanka for most of the past two decades.