Islamabad (CNN) — A rare explosion in Pakistan’s capital city of Islamabad on Tuesday has left 12 dead and 20 injured, the Pakistan Institute of Medical Sciences Hospital told reporters.

A security source in Pakistan told CNN that the explosion near the city’s High Court early on Tuesday afternoon is being investigated as a suicide attack.

The country’s president Asif Ali Zardari released a statement condemning what he called a “suicide blast” near the city’s High Court.

Islamabad requires a high level of security to enter and exit the city with specific security zones throughout the capital. The explosion took place in the parking lot of the city’s busy judicial complex in a district full of high-ranking government offices.

There has been no claim of responsibility for the attack yet

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