Islamabad: A blast went off outside the headquarters of a security agency near the airport in the southern Pakistani port city of Karachi on Thursday.
However, there were no reports of casualties, and rescue and emergency services were rushed to the site.
According to officials, the blast occurred outside the headquarters of the Airport Security Force.
A wall collapsed following the explosion though there were no reports of anyone being injured, officials said.
The nature of the blast could not immediately be ascertained.
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