Four to six kilograms of explosives were used in the suicide blast at Islamabad’s mosque, while the amount of ball bearings in the attack was unusually high, sources said on Saturday.

The unusually high amount of ball bearings caused high casualties, according to the sources.

Authorities have collected crucial evidence in the investigation being carried out by the National Forensic Agency (NFA), while NADRA was also extending cooperation.

According to officials, the attacker first opened fire before entering. He also fired six once he entered the main prayer hall.

All spent cartridges have been recovered from the scene.

Following the gunfire, the suicide bomber detonated himself inside the mosque hall.

The sources confirmed that the 4–6 kilograms of explosive material were used in the blast and an unusually high quantity of ball bearings, increasing the blast’s lethality.

The National Forensic Agency (NFA) and NADRA are assisting in the investigation to help identify the attacker.

Authorities are reviewing CCTV footage, mobile data, and other evidence from multiple angles and examining other aspects of the incident.

Investigators are also probing the planning, facilitation, and supply of explosives linked to the attack.

Security officials stated that additional details about the incident will be released once the investigation is complete.