Maharashtra Chief Minister Eknath Shinde said that the killing of a chemist in Amravati over post supporting suspended BJP leader Nupur Sharma's remark on Prophet Muhammad was "worrying". "This is absolutely worrying and all those responsible for the murder have been arrested. And now the NIA has taken over the case, it is a national level incident, the government is taking care of it," the 58-year-old told NDTV in an exclusive interview.