New Delhi, Feb4 (UNI) All India Anti-Terrorist Front Chairman MS Bitta has received a suspected letter from the Islamic State group, threatening him, his office said .Bitta's office has informed the Delhi police and later filed a complaint at the North Avenue police station about the threat letter from ISIS, a senior police officer said. Meanwhile, Delhi police have registered an FIR under Sections 506 and 507 (criminal intimidation), in connection with the suspected threat letter, said to be sent by the Islamic State to the Anti-Terrorist front Chief. "The complaint was filed by Bitta's personal secretary. Apart from Bitta, Pparty's General Secretary Vinod Bhardhwaj and other members have also been mentioned in the letter," a police official said. Last month too, a suspected ISIS signed letter, threatening to kill Prime Minister Narendra Modi and Defence Minister Manohar Parrikar, was sent to the Goa Secretariat. UNI AP RJ 0004