Dubai: Mumbai police were put on high alert after a fresh bomb threat targeted Bollywood superstar Amitabh Bachchan's Juhu bungalow, Jalsa, along with the Mayor's Office and Chhatrapati Shivaji Maharaj International Airport. According to a report on NDTV, bomb disposal squads and security teams searched the locations named in the threatening email, but found nothing suspicious. The latest scare is part of a string of threatening messages that…