Police stepped up vigil across the city today after copies of letters threatening terror attack were found at vital installations, including ISRO facility and Hindustan Aeronautics Limited. "We have stepped up vigil and conducted checks at vital facilities including ISRO," Bangalore Additional Police Commissioner (Law and Order) Kamal Pant told PTI here. Pant said there had been no intelligence from either state or central agencies on the possible terror attack, which has been mentioned in the letters. The letters written in Urdu and English speak of bloodshed to be carried here, he said .
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