New Delhi, Oct. 6 -- The National Investigation Agency (NIA) has filed a charge sheet against four people, including pro-Khalistan operatives, for the alleged involvement in a grenade attack at former Punjab minister Manorajan Kalia's residence in Jalandhar in April this year, the agency said on Sunday. The charge sheet has been filed against two arrested persons -- Saidul Ameen from Amroha and Abhijot Jangra from Kurukshetra, and two absconders -- Kulbir Singh Sidhu from Yamunanagar and Manish alias Kaka Rana from Karnal, before a Chandigarh court on Saturday. The attack on the premises of the former minister and Bharatiya Janata Party (BJP) leader was carried out on the night of April 7. The federal anti-terror probe agency took over the ...