Sri Lanka’s unfolding political crisis threatens to turn into a “bloodbath” unless order is restored, the speaker of parliament has warned.
It comes after President Maithripala Sirisena last week sacked the cabinet and suspended parliament.
But ousted PM Ranil Wickremesinghe is refusing to leave his office.
One person was killed at the weekend when the bodyguard of the sacked oil minister fired at a crowd of protesters outside his office.
On Monday, police arrested the minister, Arjuna Ranatunga, a 54-year-old former national cricket team captain and an ally of Mr Wickremesinghe, after he was accused of ordering the shooting. He was later released on bail. His bodyguard has also been arrested and an investigation is under way.
President Sirisena’s move to suspend parliament and appoint the man he defeated in the 2015 presidential election, Mahinda Rajapaksa, as the new PM has sent shockwaves across Sri Lanka.
Regional rivals are also watching events closely – China has already congratulated Mr Rajapaksa, while India, the EU and US have called for the constitution to be respected.
Sri Lankan parliament Speaker Karu Jayasuriya, who has urged Mr Sirisena to reconsider his decision to suspend parliament, told reporters on Monday: “We should settle this through parliament, but if we take it out to the streets, there will be a huge bloodbath.”
What’s going on?
The sacking of Mr Wickremesinghe has left the country with two people claiming to run the government. The ousted PM has refused to leave his residence, Temple Trees, and on Monday a spokesman for Mr Rajapaksa told the BBC they were giving him more time.
But Mr Sirisena has gone ahead and appointed a new cabinet, with Mr Rajapaksa given the role of finance minister, in addition to PM. Four MPs aligned with Mr Wickremesinghe were given ministerial portfolios in a bid to win their support.
Mr Rajapaksa is a popular but controversial figure. As president, he ended the decades-long civil war in 2009, but faced criticism for the means by which he achieved victory – many thousands of Tamil civilians are thought to have been killed by government forces in the final months of the fighting.
He also signed several large infrastructural deals with China – saddling Sri Lanka with billions of dollars in debt. The former president and his inner circle are also accused of corruption, which they deny.
Many in Sri Lanka are now worried about the fate of corruption cases targeting members of the Rajapaksa family, along with investigations into the murders of journalists and others under Mahinda Rajapaksa’s 2005-2015 presidency, says the BBC’s Azzam Ameen in Colombo, the capital.
What’s behind President Sirisena’s actions?
Mr Wickremesinghe helped the president triumph in the 2015 poll, but the pair reportedly clashed in cabinet recently over government plans to lease a port to India.
President Sirisena said on Saturday that there had been big differences over policy with Mr Wickremesinghe for more than three years.
He linked Mr Wickremesinghe to a controversial central bank bond sale, which is alleged to have led to the loss of 11bn Sri Lankan rupees ($65m; £50m).
The president also alleged that a cabinet minister was involved in a plot to kill him and that police had obstructed an investigation.
All this meant the “only alternative” was to appoint Mr Rajapaksa – his former ally turned rival – as PM, Mr Sirisena said.
For his part, Mr Rajapaksa hailed a “new democratic beginning and the rejection of the politics of hate”.
What other signs of tension are there?
Rival groups supporting Mr Rajapaksa and Mr Wickremesinghe have been gathering at different locations in Colombo.
Mr Rajapaksa’s supporters have taken over Sri Lankan state media and other state institutions. Mr Jayasuriya said that this would have serious international implications.
Trade unions linked to Mr Rajapaksa’s party have also been blocking access to ministers who are from Mr Wickremesinghe’s party, Reuters reported.
Meanwhile hundreds of Wickremesinghe supporters have gathered around Temple Trees and say they will stay there to protect the ousted PM.
The PM and his United National Party (UNP) came to power promising accountability for alleged atrocities committed in Sri Lanka’s civil war and during Mr Rajapaksa’s period as president.
Over the 26-year conflict, between 80,000 and 100,000 people are estimated to have died, with both sides alleged to have perpetrated war crimes.