At least one person was killed and 10 injured in an explosion near Karachi airport on Sunday night, according to Pakistan media.
The nature of the blast was not immediately clear, broadcaster Geo News cited a provincial official as saying.
He said at least one foreigner had been injured and that a convoy of foreigners was close to the explosion.
In a statement emailed to journalists, separatist militant group Baloch Liberation Army (BLA) claimed the explosion was an attack carried out by them using a vehicle-borne improvised explosive device targeting Chinese nationals, including engineers.