Assailants fired rockets at a paramilitary post and three homemade bombs exploded in separate attacks in Pakistan's southwestern Baluchistan province on Sunday, shattering windows but injuring no one, police said, according to AP. The first explosion occurred on the lawn of a state-run school in Kohlu, a town east of Baluchistan's capital of Quetta, leaving a crater and shattering windows in several of the school's rooms, said local police official Nabi Bakhsh. About 45 minutes later, a second bomb went off near a government administrator's office in the town, damaging the building's windows, he said. In a separate attack around dawn, assailants fired six rockets at a Frontier Constabulary post in Kohlu, but the rockets slammed into a nearby field, he said. Another bomb exploded Sunday afternoon in a western residential neighborhood in Quetta, shattering several homes' windows, said Quetta police official Pervez Zahoor. No one claimed responsibility for either attack. Bakhsh said he suspected local tribesmen for the explosions and rockets in Kohlu. On Sunday, Baluchistan police chief Chaudhry Mohammed Yaqoob said 15 people have been arrested over the bombings in Quetta and elsewhere in the province.