Will any terrorist organization take responsibility for bombing in Pakistan?

More than a hundred people have been killed in a suicide bombing in Pakistan as tensions rise in the country ahead of an election on July 25.
At least 128 people died in the explosion at an election rally in the southwestern province of Baluchistan.
Siraj Raisani, a candidate running for a provincial assembly, was among those killed in the town of Mastung. It was the deadliest attack in Pakistan in four years.
The Source: Euronews