According to Balochistan Levies, a convoy of Mir Gul Khan Marri and Bahwal Khan Marri was on way when a timed device exploded, killing eight people on the spot and destroying two vehicles.
Balochistan unrest: 7 bullet-riddled bodies found in Quetta, Pishin
Sources said the banned Balochistan Liberation Army (BLA) officials had called Marri to hold negotiations and surrender.
The BLA has also claimed responsibility for the attack.
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