Two government buildings used by security forces were blown up by Maoists on Monday at Badigatta and Marigatta areas in Orissa's Malkangiri district, official sources said.
The ultras exploded and damaged Badigatta panchayat office and a health centre at Marigatta which are used for sheltering security personnel, the sources said.
However, no casualty was reported.
The Maoists left behind posters threatening to blow up other buildings in the areas.
A school building in the area had also been exploded by the ultras a few days back, the sources said.