"Happy Independence Day-August 15" was the message left by hackers on the Cabinet's official portal, referring to India' Independence Day the next day.
They also added a photo of Indian army hoisting an Indian flag on the Siachen glacier.
A group identified as Lulzec India has claimed responsibility for the hack.
The Express Tribune tried to contact M Mujahid, the deputy director IT at Cabinet Division, the person responsible for the maintenance of the website; however, he was not available for comment.
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