"We have stepped up security and intensified checking on two main entry points towards the RGIA. The measure has been taken following the anonymous threat letter. Vehicles passing on the routes are being checked and the personnel have been asked to be more careful," Joint Commissioner of Police Y Gangadhar (Cyberabad Commissionerate) told PTI.
Additional police forces have been deployed on the routes and near the airport. Personnel at the two check-posts on the routes have been alerted and the security checks will continue for the next few days, the senior police officer said.
"In view of the first anniversary of the Dilsukhnagar twin blasts, police were already conducting frisking and checking which has now been intensified," Gangadhar said.
When asked on the language and other details in the letter, he said, "The contents of the letter are not yet known. We have only been informed to be on alert following the anonymous threat letter."
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The letter does not clarify the handler or source of the explosives but states that the flight may come or go to Delhi.