Seven staff members of the building saw the eighth floor on fire around 8:30am and went up but were trapped on the seventh floor by the spreading fire. Firemen and others responding to the emergency rescued them safely.
A security guard was slightly burnt in his hand, but nothing serious.
A Pakistan Air Force helicopter called to spot anyone else needing to be rescued, returned after circling the building for some 10 minutes.
Full extent of the damage to the building, and the companies that occupy it is yet to be assessed.
Meanwhile, Islamabad Chief Commissioner Tariq Mehmood Pirzada has directed Assistant Commissioner city Mohammad Ali to conduct an inquiry into the cause of the fire and fix responsibility.
UBL Building stands next to the Shaheed-i-Millat Secretariat Building which was completely gutted a decade ago, evoking calls for better fire safety in Pakistan`s premier city.
Thick clouds of smoke bellowing from the burning floors of the UBL Building could be seen from far and heat of the fire was felt on the ground close to the building.
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