QUETTA: Three explosions jolted Quetta on Saturday, but no casualty was reported, a police officer said. A homemade explosive device detonated in front of the Frontier Corps headquarters near the PTV residential colony early on Saturday. Two bombs exploded late on Friday. Police officials were unable to identify where the explosions took place but later the DIG of police said that a bomb exploded in front of the IG prison's office. Police sources said that another bomb exploded near the assembly building. Both bombs caused no damage. Unidentified people hurled a grenade at the Radio Pakistan building, damaging a car.