Express News correspondent Sajjad Shafiq reported that a suspicious car was taken into custody but no one came to claim it.
The Bomb Disposal Squad (BDS) has reached the office and is searching inside the car for the explosive materials.
The office building has been emptied in light of the situation.
Previous bomb scares
Two bomb threats in Karachi were cleared by the BDS on February 6.
It was reported that information was received regarding the presence of two bombs at the Karachi Water and Sewerage Board Head Office as well as the Sindh Industrial and Trading Estate (SITE) area of the city respectively.
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