The chief minister's convoy was attacked on Tuesday at Saryab Road in Quetta which resulted in the death of one person while injuring 12 others.
The Inspector General (IG) of Balochistan constituted four investigation teams to probe the attack, which arrested more than 30 suspects from different areas of the province.
Meanwhile the body parts of the suicide bomber have been sent to the laboratory for tests, while a Federal Investigation Agency (FIA) team has also collected evidence from the blast site.
Earlier in the day, Chief Minister Raisani said the incident was an act of terrorism carried out either by the Lashkar-i-Jhangvi or the Baloch Liberation United Front.
He said both these organizations are banned militant outfits which will be pursued vigorously.
Addressing the media at an inaugural ceremony Raisani also said that there is no reason for carrying out drone attacks in Balochistan.
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