Islamabad — Pakistan opened a probe Wednesday into the suicide bombing outside an Islamabad district court that left 12 dead the day before, underscoring the challenges facing the government as it struggles with militant attacks, border tensions and a fragile ceasefire with Afghanistan.

The attack at the court, located on the edge of the city and next to a residential area, also raised alarms that despite multiple operations by the security forces to crush the militants, they are still capable of mounting high-profile bombings — even in the Pakistani capital.

Pakistan has struggled with a surge in militant attacks in recent years but until Tuesday's bombing, Islamabad has largely been considered a safer place.

Forensic teams and police were combing Wednesday through debris at the site

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