India will never forget the cowardly attack on its Parliament, Prime Minister Narendra Modi said on Sunday as he paid tributes to security personnel who laid down their lives in the terror attack on this day in 2001.

"We will never forget the cowardly attack on our Parliament on this day in 2001. We recall the valour and sacrifice of those who lost their lives protecting our Parliament. India will always be thankful to them," he tweeted.