Akmeemana Dayarathana was arrested after he reported this morning to record his statement at the police's Colombo Crime Division. He and another monk was asked to report to the police yesterday following the arrests of four others.
They were accused of storming a house of Rohingya refugees in a suburb here last week.
Dayarathana was later produced before the court which remanded him into custody till October 9.
The attack on the refugee centre, which housed 31 Rohingya refugees, was led by Dayarathana's radical Sinhale Jathika Balamuluwa (Sinhalese National Force), which uploaded videos of the attack on their Facebook page.
The police had to relocate the Rohingya Muslims to a safe location in Boossa in the south of the country following the attack.
The arrests came after the government ordered a crackdown on the mob following the attack.
Earlier, a woman was among two persons arrested in Sri Lanka for allegedly attacking a group of Rohingya refugees from Myanmar.
In 2008 and 2012, two groups of Rohingya refugees had been rescued from the seas and accorded UNHCR facilities before being repatriated.
Nearly 500,000 refugees have crossed the border from Myanmar's Rakhine State since August 25 when a military crackdown was launched following attacks on security forces allegedly by Rohingya militants.
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