Dozens of military army officers, including some senior ones, have been arrested over an alleged plot to overthrow long-time president Yoweri Museveni, Ugandan sources said.
Army spokesman Lieutenant Colonel Paddy Ankunda said on Sunday that more officers are being held over alleged acts of subversion. One of those in detention is a colonel with Uganda's air forces.
He said the officers have suspected links to an opposition politician, Michael Kabaziguruka, who is being questioned by the police over similar allegations.
Mr Kabaziguruka is a close ally of opposition leader Kizza Besigye, who was charged with treason following a disputed presidential election in February. Mr Besigye refused to accept the official results and claimed he had won the election.
Mr Museveni has been in power since 1986.