Despite intelligence warnings of a possible threat to Nagarjuna Sagar dam from anti-social elements, security was not beefed up. At present, 70 constables headed by an SI of TS Special Protection Force are providing the security to the dam. Surprisingly, weapons were not given to them. Twelve CCTV cameras were fixed at various points for surveillance of the dam. But, the cameras are not working. The control room set up to monitor cameras was closed and walkie-talkies used for communication are not functioning.