Police have intensified checking and frisking operations besides tightening security following intelligence input that a "human bomb" has entered the state capital.
Police stations have been put on alert and intesive checking and frisking operations are being conduced in sensitive areas and public places, police sources said on Thursday.
The state Intelligence Department is said to have received input from Central agencies that a human bomb is moving in the city to trigger blasts and create disturbance, they said.
Police Commissioner B Prasada Rao on Thursday issued prohibitory orders banning any kind of assembly or public meeting or procession within a radius of one kilometre of the Andhra Pradesh Assemly and Council premises. The order would be in force for seven days.
The city was rocked by bomb blasts in May and August last year.