A roadside bomb in Afghanistan has killed at least three security guards, a senior police official said Saturday, dpa reported.
The incident took place on Friday evening in the south-central province of Logar, where a bomb placed on the highway struck a private security company's vehicle, Ghulam Sakhi, the provincial police chief said.
"Three guards were killed and another one injured as a result of the explosion," he said. Afghan private security companies secure NATO-led forces logistics and convoys in troubled south and east highways.
Insurgents frequently attack security guards protecting the military convoys in Afghanistan. Seven guards were killed in a Taliban ambush on Thursday in the western province of Farah.