Tata Sons Chairman N Chandrasekaran on Saturday said Air India, which is undergoing a transformation, is not just a business opportunity but a “responsibility” for the Tata Group.

Delhi saw its coldest November in five years as per IMD, with an average minimum temperature of 11.5 degrees Celsius and no rainy days, highlighting a continuing dry spell.

The National Investigation Agency (NIA) brought Shahid, a former pharmacologist at Al-Falah University, to the university campus on Thursday for on-site questioning.