Kyrgyz officials say the younger brother of ousted President Kurmanbek Bakiev, Akhmat Bakiev, has been detained in the southern city of Jalal-Abad.
Deputy Interior Minister Melis Turganbaev said that Ahmat Bakiev was arrested during a raid in Jalal-Abad by special forces late on July 21.
Officials said Akhmat Bakiev was armed at the time of his arrest, but did not offer resistance. He is expected to be transfered to the capital Bishkek later on July 22.
Police said he confessed to being involved in riots involving ethnic Kyrgyz and Uzbeks in the south following President Bakiev's ouster.
The interethnic violence in the south left several hundred people dead and forced hundreds of thousands to flee their homes.
Police said Akhmat Bakiev was found with two pistols as well as a wig and paste-on moustache and beard. He did not offer any resistance during his arrest.
Another Bakiev brother, Zhanybek Bakiev, used to be the head of the state security guard and is accused by the authorities of giving the order to open fire on protesters during the popular uprising in April that led to Kurmanbek Bakiev's ouster.
Zhanybek Bakiev is on the run, while the former president is currently living in Belarus.
RFE/RL's Kyrgyz Service, with agency reports