ISLAMABAD — The United States, the United Kingdom, Australia and Iran have condemned a suicide bombing at an imambargah in Islamabad that killed at least 31 people and injured 169 others during Friday prayers, as Pakistan launched a full investigation into one of the deadliest attacks in the capital in recent years.

The blast occurred at Imambargah Khadijah al-Kubra in the Tarlai area, where a large number of worshippers had gathered. Authorities said the attacker detonated explosives after being confronted by security guards at the entrance, triggering an emergency response at major hospitals in Islamabad and neighbouring Rawalpindi.

At least 31 killed, 169 injured in suicide blast at Islamabad imambargah

The United States Embassy strongly condemned the attack. Chargé d’Affaires Natalie A. Baker said innocent worshippers were killed and injured and described attacks on civilians and places of worship as unacceptable. She extended condolences to the victims’ families and reaffirmed continued US support for Pakistan’s efforts to promote peace, security and stability.

The British High Commission also denounced the bombing. High Commissioner Jane Marriott said she was outraged and heartbroken by the violence, adding that the United Kingdom stands with Pakistan in condemning the attack.

Australia’s High Commissioner Timothy Kane said he was shocked and saddened by the attack at the Islamabad mosque, offering sympathies to the victims, their families and all those affected. He said Australia stands with Pakistan during the time of mourning.

Iran’s Ambassador to Pakistan Reza Amiri conveyed what he described as deep condolences to the government and people of Pakistan, particularly the bereaved families. He condemned the bombing as a terrorist attack on civilians during prayers and offered prayers for the recovery of the injured.

According to officials, the attacker attempted to enter the imambargah and opened fire when stopped by security personnel. After a brief exchange, he moved inside the premises and detonated the explosives among worshippers. Rescue teams rushed to the site and transported the dead and injured to hospitals across the capital.

Islamabad Deputy Commissioner Irfan Nawaz Memon said an emergency was declared at Pakistan Institute of Medical Sciences, Polyclinic Hospital and CDA Hospital. Hospital officials said dozens of injured people were admitted, while some victims were taken to medical facilities in Rawalpindi.

Law enforcement agencies, Pakistan Army troops and Rangers sealed off the area and began forensic and intelligence investigations. No group immediately claimed responsibility. Police and government sources said the attacker had been identified and that the probe was continuing to establish the full circumstances of the attack.