NEW DELHI: India's defence minister said documents relating to the French Scorpene submarine being built in the country appeared to have been hacked, after an Australian newspaper reported a leak of thousands of pages detailing the vessel's top-secret capability.

"I understand there has been a case of hacking, we will find out what has happened," Manohar Parrikar told reporters. The submarines are being built at a state-run shipyard in Mumbai in collaboration with France's DCNS Group.