NIA team, which came to investigate the grenade attack on Nirankari Bhawan in Amritsar, team of 3 members started the investigation. According to sources Khalistani militants might have a hand in the attack on Nirankari Bhawan. The DGP termed the attack on Nirankari Bhawan as a terror attack, and even the Khalistani militants may have link to the ISI, According to the security force Kashmiri terrorist group may also involve in the attack. Al Qaeda terrorist Zakir Musa also met Khalistani sleeper cell.