The joint committee formed to probe the PNS Mehran attack in Karachi began investigations on Thursday.
The investigation committee, headed by Rear-Admiral Tehseenullah Khan, includes a commodore, two captains, a surgeon commodore, an air commodore and a group captain. Other members include personnel from rangers, police and the Federal Investigation Agency (FIA).
Navy and Air Force personnel serving at the base have been questioned so far. Cell phone records of all personnel on duty at the time of the attack are also being checked by the committee.
The committee has also verified that the attackers used night vision goggles and were able to target security forces with pin-point accuracy.
Authorities have failed to make any progress on identifying the attackers. The fingerprints have been sent to National Database and Registration Authority (NADRA) for verification.
Police have said the ethnicity of the attackers will be determined once the autopsy and DNA tests have been completed.