The operation was launched in Kanduli area in Assam's Hamren police district based on information provided by 10 United Peoples Liberation Army (UPLA) militants arrested yesterday for their alleged involvement in the killing of Goswami and his PSO Ratul Nunisa.
Hamren SP Debojit Deuri, who led the operation, told PTI the 9 mm pistol of Goswami and Nunisa's AK-47 rifle were recovered from the area during the operation.
Besides, six AK-47 rifles, a M-16 rifle, a SBBL gun, 10 mortar cells, 21 grenades and 356 cartridges were also recovered from the area, he said.
Ten UPLA militants, including its self-styled commander-in-chief (C-in-C) and deputy C-in-C, allegedly involved in Goswami and his PSO, were arrested yesterday.
Goswami was leading an operation on June 5 against the insurgent group in remote Rongthang forest area when they came face to face with a large group of ultras who opened fire on them killing the duo on the spot.
Operations have been stepped up in the district following the killing of the police officer and his PSO, Deuri said.