"The blast killed 15 civilians and wounded another four," he added, also pointing out that a number of children were also seen among the casualties.
The spokesperson further explained that a truck was on its way from Khair Abad village to Khansheen district centre in Helmand province when it was detonated by a home-made device.
Another bomb attack near an Afghan army base in the country's north wounded at least 14 people, including three local women.
Some of the victims are reportedly in critical condition.
The explosion took place in Char Darah district in Kunduz province.
The bomber used a police vehicle recently stolen by militants.
No group has yet claimed responsibility for the attack.
The latest upsurge of violence comes as a UN report shows that more civilians were killed in 2010 than any other year since the US-led invasion of the country in 2001.
According to the report, the civilian fatalities have risen by 31 percent in the first six months of the year, giving rise to increased anti-US sentiments in the troubled region.
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