Mumbai, Nov. 13 -- An email was received by the office of Mumbai Mayor Ritu Tawde, threatening to target her office, bollywood actor Amitabh Bachchan, singer-actor Diljit Dosanjh and several city-based schools, police said, adding that the responsibility for the email has been claimed by an outfit that calls itself Khalistan National Army (KNA). The police said they conducted the required checks on receipt of the email and nothing suspicious was found. The email was received by the Mayor's office at 11.30 am on Thursday. The email threatened to target the Mayor's office at 3 pm, the schools at 1 pm, Bachchan's Jalsa bungalow in Juhu from October 31 to November 27. "Singer Diljit Dosanjh's 'India Tour' concert is scheduled on November 27 at the Mahalaxmi Racecourse. The Delhi police have already rejected permission to his concert there citing security concerns," an officer said.htc...