The Iranian-flagged vessel had been located by the Navy's Maritime Reconnaissance aircraft on August 12, which thereafter kept it under continuous surveillance.
INS Mysore, a guided missile destroyer, was dispatched to intercept the vessel with two helicopters as well as 24 of the Navy's elite Marine Commandos (MARCOS). The MARCOS carried out a thorough investigation and found two AK-47 rifles and a pistol concealed in an empty fuel tank.
MV Nafis-1 had reportedly sailed from Chah Bahar in Iran to an undisclosed location in July.
Intelligence received by the Indian Navy had indicated that the vessel could have been employed for smuggling or other nefarious activities. Inputs suggest that the vessel was likely to be carrying arms and ammunition, as well as other contraband.