Security agencies probing the Delhi High Court blast are taking every email seriously but do not rule out the possibility that it may have been sent by someone who wanted to play a prank, government said today.

Talking to reporters after day-long National Integration Council (NIC) meeting, Union Home Secretary R K Singh said "we are not dismissing any email. We are investigating each and every email we have got."

He said security personnel were attending to all emails received and added "whosoever sent it, we are not dismissing these emails."

However, the Home Secretary indicated there was a possibility that this could be a prank being played by someone. "But at the same time, we are not saying these emails have necessarily been sent by people who were responsible for it (the blast).

"It could be other people who heard about the blasts and sent the email just to sort of fish in troubled waters. We are not coming to any conclusion at all. The interrogations are going on," he said.

Asked whether the participants at the NIC brought up the terrorism issue, he said "they are concerned about terrorism but the point is that they realise we are in an area which is very close to the epicentre of terrorism.

"Most speakers realised that and we are battling, fighting a certain kind of terrorism," he said and added no update about the Delhi High Court blast was shared.