Four people have been arrested on suspicion of facilitating a suicide bombing that killed more than 30 people on Friday, Pakistan's interior minister has said. Mohsin Naqvi stated that an Afghan national, who is alleged to be the mastermind behind the attack, was among those detained. The raid to arrest the suspects resulted in the death of one counter-terrorism officer and injuries to three others. The Islamic State group has claimed responsibility for the bombing at the Shia mosque in the Tarlai area, which was crowded with worshippers. This incident has been marked as the deadliest attack in the capital for over ten years, and consequently, thousands of mourners have gathered in Islamabad to pay their respects to the 32 victims. Security measures have been escalated in the city, and authorities have announced a commitment to enhance public safety moving forward.