The crew and guards have not been able to satisfactorily explain why they had entered Indian waters, sources in defence agencies have said.
Semi-automatic weapons have been found on board the ship, but sources say, the crew has failed to produce the necessary documents required to carry such weapons.
The ship's Captain has reportedly told investigators that the guards belong to a company which provides armed escorts, especially to merchant vessels in pirate-infested areas of southern Indian Ocean as well as Gulf of Aden.
Usually, ships do not carry the number of weapons as MV Seaman Guard had on board, making it a matter of slight concern to Indian authorities.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.