4 killed as violence persists in Pakistan January 1, 2012 -- Updated 1441 GMT (2241 HKT) Explosions continue to rattle Pakistan, near the Afghan border Three people are killed in Balochistan province, still reeling from Quetta attack Another blast claims the life of a 7-year-old boy Islamabad, Pakistan (CNN) -- Explosions in western Pakistan killed four people Sunday, including a young boy, authorities said. 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. The Dera Bugti attack came just two days after an explosion outside the home of a former lawmaker in the provincial capital of 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.