The National Investigation Agency (NIA) on Friday filed a supplementary chargesheet against two accused, Afshan Parvaiz Jarabi and Tawheed Latief Sofi, both residents of Srinagar, J&K, before the Special NIA Court in Delhi under sections 120B, 124A, 153A of the IPC & Section 18, 38, 39 of the UA(P) Act.