Bollywood actor Amitabh Bachchan greeted fans from a bulletproof enclosure outside his home in Mumbai, Al Jazeera English reported. The outlet's report links the use of the enclosure to a bomb threat, according to its headline. Who made the threat, how it was delivered, whom it targeted and when it was made are not yet known. Whether authorities have taken action, when the greeting took place and whether the enclosure was installed because of the threat are also not yet known.