A car lifter removes a damaged vehicle from the site of a bomb explosion in Quetta on November 21, 2012.
A bomb attack on a Pakistan army vehicle has killed at least five people and severely injured several others in the violence-wracked southwestern city of Quetta, the capital of Balochistan Province.
The causalities come after a remote controlled bomb tore through the military vehicle escorting children from different schools on Wednesday.
Local police officials say at least four soldiers and a woman were killed in the deadly attack.
Nearly two dozen injured have been shifted to a nearby hospital. Sources say the death toll is expected to rise as some of the wounded are in a critical .
No group has claimed responsibility for the attack, but police officials put the blame on pro-Taliban militants or some Baloch insurgent groups, who have carried out similar assaults in the past.
In the past few months insurgent have destroyed dozens of gas pipelines and power towers in different parts of Balochistan.
Some Baloch insurgent groups say they want greater political autonomy and a share of the province's natural resources.
Militants have carried out numerous attacks against security forces as well as civilians and managed to spread their influence in various regions of the country, despite frequent offensives by the Pakistani army.
Thousands of Pakistanis have lost their lives in bombings and other militant attacks since 2001, when Pakistan entered an alliance with the US in the so-called war on terrorism.
Thousands more have been displaced by the wave of violence and militancy sweeping across the country.