Teargas was reported in Moroto town after FDC supporters reportedly attacked a police barracks.
Besigye was detained at Moroto police station since his arrest in Kampala on Wednesday.
FDC officials said they had visited him in prison and even had dinner together.
They however complained of the darkness as the place lacks adequate power supply.
On Friday evening, Besigye’s supporters raided and surrounded the police barracks demanding for the release of their president.
FDC preacher Doreen Nyanjura said Besigye had been taken to Moroto court.
FDC spokesman Ssemujju Nganda confirmed the development.
Nganda said Besigye was charged with treason and remanded to Moroto prisons.
Treason is the crime of betraying one’s country, especially by attempting to kill the sovereign or overthrow the government.
Besigye appeared before the Moroto Chief Magistrates Court presided over by the acting chief magistrate Charles Yepeise amid heavy security.
He was remanded until May 25 when he will re-appear in court for further mention of the case.
Besigye had no lawyer when the charges were being read to him.
He was not allowed to take plea because treason is a capital offence only triable by the High Court.
Prosecution alleges that while in various places, Besigye declared himself as president for having won the February 18 presidential elections.
In 2005, Besigye was charged with treason when he made it known that he was going to challenge president Yoweri Museveni but government lost the case.
Uganda’s Constitutional Court quashed the treason charges against him in October 2010.