Director Anurag Kashyap along with 48 other Bollywood celebrities, on Tuesday, had expressed concern over the rise in lynching and hate crime cases to Prime Minister Narendra Modi through an open letter.The letter was followed by a statement signed by another section of celebrities, including Kangana Ranaut and Prasoon Joshi, who termed it 'selective outrage'.But that wasn't the only response to the open letter. Two days after it went public, a Twitter user sent a death threat to the 'Manmarziyaan' director. In the now-deleted tweet, the user said that he had cleaned his rifle and shotgun and was waiting to point it at Kashyap.The 'Gangs of Wasseypur' director forwarded the tweet to Mumbai Police on the micro-blogging site. In response to which, the Mumbai Police asked him to file a complaint at a police station so that the investigation could be initiated. They wrote, "The cyber police station has been sent the account details. Request you to file a police complaint at the your nearest police station for legal action to be initiated."On the work front, Kashyap is producing Bhumi Pednekar and Taapsee Pannu-starrer 'Saand Ki Aankh'. Helmed by Tushar Hiranandani, the film is slated to release on October 25.