Bennet Rupasinghe, the editor of Lankaenews website, was produced before the magistrate at Kaduwela who ordered him to be remanded till April 7, officials said.
Rupasinghe was asked to report to the Colombo northern suburb police station at Wellampitiya to make a statement over the alleged threat issued by him. Rupasinghe has been charged with threatening the brother of one of the two suspects in remand for the arson attack.
In January this year, an unknown group had torched office of the Lankaenews, the anti-government news website.