A group calling itself the "Pakistani Cyber Army" has hacked into the website of India's federal crime investigation bureau and left a warning message to Indian hackers.
The website of the Central Bureau of Investigation (CBI) was penetrated as nuclear-armed rivals India and Pakistan have made efforts to repair relations and build trust that evaporated after the 2008 Mumbai Attacks.
The website has remained shut for the day after the action against it Friday night. The group has warned it would carry out the "mass defacement" of Indian websites.
However, CBI registered a case for the defacement of its website. It has come to the notice of CBI that its official website was unauthorisedly accessed and defaced.
The Indian government has flagged concerns over its cyber security after a series of attacks on government websites by suspected Chinese hackers, including the office of the National Security Adviser.