Chief Justice Tassaduq Hussain Jilani took suo motu notice of the attacks on the district and sessions court on Monday and has summoned the interior secretary, the chief commissioner and the inspector general, Islamabad on Tuesday.

Meanwhile, Interior Minister Chaudhry Nisar Ali Khan who recently described Islamabad as a safe city, told the National Assembly on Monday that the attack on the courts started at 9.05 am and two persons wearing chadars entered the court area through a side lane.

They first fired in the air and then they shot everyone in their way. There were 47 policemen on security duty but there was confusion on the number of terrorists who were there. The police said there were two of them while intelligence agencies said there were three of them, the Minister said.

Describing the district court as a soft target since it was open from all sides, he said there were two suicide bombers, one of whom was shot and he blew himself up as he fell down, and a crater was testimony to that. The other suicide bomber detonated himself. All of them were armed with AK 47s and one of them was wearing a red jacket, he said.

The Minister said the media and other people were saying that there were more gunmen. He said the lanes were so small that it was difficult to see what was happening in the whole area at one go.

He said details will be revealed tomorrow in the apex court and he didn't want to present contradictory information.

Meanwhile, the Tehreek e Taliban Pakistan(TTP) which just called for a month -long ceasefire, has denied it was responsible for the attack. Dawn reported that Ahrarul Hind, a little -known splinter group of the TTP, claimed that the group was responsible for the assault.