"An SIT (special investigation team) was formed which filed a comprehensive charge sheet against four accused before a Sessions Court in Anantnag," a police official said.
Achabal SHO Feroz Ahmad Dar and five others were killed in the attack on June 15, 2017.
The police official said that during the investigation of the case, it was established that the Pakistan-based Lashkar- e-Taiba (LeT) militants, headed by Bashir Lashkari, were involved in the attack.
He said the other accused in the case are Sandeep Kumar, a resident of Uttar Pradesh who was arrested by the police in July last year; Mohammad Ashraf Wani alias Molvi, a resident of Anantnag; Khurshid Ahmad Ganaie, a resident of Dialgam; Mehraj-ud-din Bangroo alias Asif, a resident of Srinagar; Sahir Ahmad Makroo, a resident of Bijbehara; and Zeenatul Islam, a resident of Shopian.
"On the basis of evidence collected during the course of investigation, complicity of the accused persons was established, of whom two Sandeep Kumar and Mohammad Ashraf Wani - were arrested in the instant case," the official said, adding that the other four were on the run.