Sri Lanka's President Maithripala Sirisena prorogued the parliament with effect from 12 noon (local time) on Saturday, a day after he removed Ranil Wickremesinghe as prime minister and replaced him with former leader Mahinda Rajapaksa.
"The president has prorogued the parliament," cabinet spokesman Rajitha Senaratne told reporters.
The move comes after Wickremesinghe, who says he remains prime minister, urged the speaker to convene the parliament on Sunday to prove he still retained his parliamentary majority.
Earlier on Saturday, Sirisena issued a formal notice for Wickremesinghe to step down as prime minister and recognise his shock dismissal, in an unfolding constitutional crisis.
Hours after sacking his former ally, President Sirisena issued gazettes formalising the dramatic move, and the installation of one-time strongman Rajapakse as the new prime minister.
However, Wickremesinghe continued to occupy Temple Trees, the official residence of the prime minister, and insisted in a letter to Sirisena that he was still in office.
He has said that he can be removed only by parliament where his party enjoys a majority, and also vowed to seek legal action against what he condemned as an unconstitutional move against him.
'I remain as prime minister'
"I am addressing you as the prime minister of Sri Lanka," Wickremesinghe told reporters at a nationally televised press conference on Friday night.
"I remain as prime minister and I will function as the prime minister."
Since his rushed swearing in, Rajapakse is yet to announce the formation of a cabinet – which under the constitution is automatically dissolved when a prime minister is removed.
Jayasuriya has said he will decide on Saturday whether to recognise Rajapakse or not, after seeking legal advice.
Parliament is not due to meet until November 5 when the 2019 national budget is due to be presented. The Supreme Court, which is empowered to resolve constitutional disputes, is shut for the weekend and reopens on Monday.
The president's United People's Freedom Alliance party had earlier Friday quit the coalition that had governed with Wickremesinghe's party.
Speaking to jubilant supporters outside his Colombo home late Friday, Rajapakse also called on Wickremesinghe to step down.
Members of his party must "respect democracy, respect the country and respect the law", the former president said through a loud hailer from a balcony.
US urges calm
Overnight, Rajapakse loyalists stormed two state-owned television networks –– which they regard as loyal to the outgoing government –– and forced them off the air.
Video footage from private networks showed police overwhelmed by mobs at the Rupavahini national TV station but elsewhere in the capital streets remained calm.
The United States called on all sides in Sri Lanka to operate within the constitution and refrain from violence, and urged the island to move forward on post-war reconciliation.
Rajapakse crushed the decades-long Tamil Tiger uprising while in power, but refused to acknowledge abuses committed during the bloody civil war.
After Sirisena's election in 2015, Sri Lanka shifted from confrontation to conciliation with the US and other Western powers and promised at the UN Human Rights Council in Geneva to investigate allegations of abuses.