Kathua, Mat 21: An FIR was today registered against the brother of senior BJP leader Lal Singh after a video showing him using “derogatory” language against Chief Minister Mehbooba Mufti during a rally here went viral. “A case under section 509 (word, gesture or act intended to insult the modesty of a woman) of Ranbir Penal Code and Section 66A of the Information Technology Act was registered against Singh’s brother,” Senior Superintendent of Police, Kathua, Shridhar Patil said. He said the police has started the investigation in the case. Singh, former State Minister, had yesterday led a massive rally from Lakhanpur to Hiranagar in Kathua district to press for CBI probe into the rape and murder of an 8-year-old girl in January. The 26-second video clip purportedly shot during the ‘Dogri Swabhiman’ rally shows Choudhary Rajinder Singh, younger brother of Lal Singh, atop a vehicle and using abusive language against the Chief Minister.