The Chief Minister’s Office at the Andhra Pradesh Secretariat on Wednesday received a threat call stating that a bomb had been planted inside the building.

The phone call was received by the security wing in the afternoon that a bomb has been kept in the ‘C’ Block of the Secretariat which houses the CMO, police sources said.

Soon senior police officials and bomb disposal squads swung into action and began searches in the CMO, they said.

Chief Minister K Rosaiah, several ministers and top officials were attending a video conference in the conference hall of the Secretariat while the searches were on.