A 25-year-old man was arrested on Thursday for allegedly threatening to blow off a mosque in Uttar Pradesh and shoot its cleric if he was not removed, police said.

A letter, threatening to shoot Imam Mufti Khurshid Alam and explode the Jama Masjid in Kila area here, was pasted by the accused on the wall of the mosque on Wednesday, Superintendent of Police Satyarth Aniruddh said.