Malkangiri, Dec 24 (ANI): Maoists blew up a government block office building at Padia area of Malkangiri district in Odisha. The red rebels set the building on fire before triggering a powerful blast, causing extensive damage to the structure, there have been no reports of any injuries till now. Police said a combat operation is underway. In the meanwhile, local residents said at first they mistook the attack as Christmas celebrations but soon realized that the building was on fire. Maoists had blown up the new building of Padia block office in September, 2010, following which business was carried out from the old building that is now destroyed, said Police.