One person succumbed to his injuries and two others were hospitalised in the political crisis in Sri Lanka which took an ugly turn on Sunday.
Bodygaurds of Petroleum Minister Arjuna Ranatunga, a loyalist of Prime Minister Ranil Wickremesinghe, fired live rounds at the supporters of the new Prime Minister Mahinda Rajapaksa.
It was the first report of serious violence since Sirisena sacked Wickremesinghe on Friday and installed former strongman Mahinda Rajapakse as the new prime minister, triggering political chaos.
The security personnel was arrested at the Ceylon Petroleum Corporation (CPC) premises in Dematagoda following a tense situation on Sunday, police said.
The incident took place when the cricketer-turned-politician visited the CPC office, with several Ceylon Petroleum Corporation workers objecting to his presence at the office.
When Ranatunga entered the building the supporters of the new prime minister Rajapaksa took exception to him visiting the office and shouted slogans.
When they were not allowed to move out, shots were fired which injured three persons. Unconfirmed reports said that two of Ranatunga's security personnel have been arrested.
Ranatunga is a supporter of Wickremesinghe who was sacked by Sirisena. Wickremesinghe holds his sacking was illegal and unconstitutional.
Sri Lanka is facing a political crisis after President Sirisena sacked prime minister Wickremesinghe on Friday, and appointed former strongman Rajapaksa as the new prime minister.
A new caretaker government is expected to be sworn in on Monday.
Sri Lankan President Maithripala Sirisena's decision to appoint his predecessor Mahinda Rajapaksa as prime minister has raised political insurgence in the country.
Sirisena also suspended parliament till November 16 after Wickremesinghe sought an emergency session to prove his majority. His office also announced that with Wickremesinghe's sacking the Cabinet stands dissolved.
(With inputs and PTI)