LUCKNOW, May 6 -- The National Investigation Agency (NIA) has filed a chargesheet against three accused, including two from Uttar Pradesh and a Hyderabad-based doctor, in an alleged ISIS-linked conspiracy to carry out mass poisoning using ricin, a biological toxin, senior officials said in a press note.

Officials said the chargesheet was filed before a special NIA court in Ahmedabad on Tuesday. It names Dr Syed Ahmed Mohiuddin as the prime accused, along with Azad Suleman Shaikh of Shamli and Mohammad Suhel of Lakhimpur Kheri. The three have been booked under provisions of the Unlawful Activities (Prevention) Act (UAPA), the Bharatiya Nyaya Sanhita (BNS) and the Arms Act, they said.

Investigators said the two UP accused played a key rol...