Islamabad , Pakistan ( CNN ) -- A series of explosions in western Pakistan killed four people Sunday , including a young boy , authorities said . Fourteen others were wounded . A blast in Pakistan 's volatile Balochistan province left three members of the country 's security forces dead , and two more wounded , military and police officials said . The victims were part of a convoy escorting civilians through the Zain Koh area of Dera Bugti , said Ghulam Muhammad Baloch , a police official . Nine people were wounded when militants lobbed a hand grenade at a shop in the provincial capital of Quetta , speeding away from the blast . No deaths were reported in the attack , but one person was in critical condition , said Nazir Kurd , another police official . The attacks came just two days after an explosion outside the home of a former lawmaker in Quetta killed 13 people . Also Sunday , a 7-year-old boy died in a roadside bombing in Pakistan 's tribal Bajaur agency , said Islam Zeb , a government official . Three others were wounded in that attack . Journalists Wajahat S. Khan and Saboor Khattak contributed to this report .
NEW : A grenade attack wounds nine at a Quetta shop . Three people are killed in Balochistan province , still reeling from Friday 's Quetta attack . Another blast claims the life of a 7-year-old boy .