Punjab Chief Minister Captain Amarinder Singh on Wednesday accused Pakistani Intelligence Agency ISI for the attack on Nirankari Bhawan in Amritsar saying the incident was a “pure case of terrorism”.

Addressing a press conference, he said there was no communal angle to the case, adding that the prayer meeting was attacked as it was an easy target.

Singh further claimed that the grenade that was used in Amritsar on Sunday to kill three people was made in Pakistan.

“This is the type of grenade which has been taken from other modules. This is the one that is being used against forces in Kashmir. This one is made by Pakistan Army Ordinance factory and is filled with pellets,” the Punjab CM said.

The chief minister also announced the arrest of one of the two persons involved in the attack.

26-year-old Bikramjit Singh has been arrested, he said, adding that the other accused, one Avtar Singh will be arrested soon.

Singh further said the government had in the past received information about other organisations being targeted but was prevented after precautionary measures were adopted.

Three people were killed and 20 injured when two motorcycle-borne men threw a grenade at the Nirankari Bhawan in Adliwal village in Rajasansi area, about 15 km from Amritsar, on Sunday.

The men, armed with a pistol and their faces covered, had forced their way into the Bhawan after taking the civil guards hostage at gunpoint. They then lobbed the grenade into the prayer room.

Singh had earlier on Monday said the grenade attack at the Nirankari Bhawan in Adliwal seemed to carry Pakistan’s signature, with initial investigations indicating that the grenade used was similar to the ones being manufactured by the Pakistani Army Ordinance factory.

Read | Amritsar grenade attack has Pak signature: Amarinder Singh

The CM said the police had recovered similar HG-84 grenade from a terror module busted by the Punjab Police last month, indicating a high probability of the involvement of inimical forces from across the border.

Read | Amritsar attack: Punjab Police detain hardliners for questioning

The police had initially said they were also investigating the possible involvement of Khalistani terrorists. They had detained a few people having links to separatist organisations.