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Nine children and four women die in the blast, and two men are injured, police say

Their vehicle hit a roadside bomb in the southern province of Uruzgan

Roadside bombs are primarily used by militants to target international forces

Kabul, Afghanistan CNN  — 

Thirteen people were killed by a roadside bomb in Afghanistan’s southern Uruzgan province, police said Thursday.

The vehicle hit the homemade device as it traveled near the district of Dehrawod, Uruzgan provincial police spokesman Farid Ayell said.

The blast killed nine children and four women, he said, as well as injured two men.

He blamed the attack on “the enemies of Afghanistan.”

Roadside bombs – used primarily by militants to target members of NATO’s International Security Assistance Force – are a frequent cause of Afghan civilian casualties.