The attack on Nirankari Bhavan here is a case of "terrorism", Chief Minister Amarinder Singh said on Monday and hinted at the involvement of Pakistan in the blast, in which three people were killed.

After visiting the attack site, the chief minister said certain "leads" have been found which are being pursued aggressively and assured that culprits would soon be arrested. The CM has also announced a reward of Rs 50 lakh for anyone providing information on those involved in the blast.