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The three guards are accused of killing a Pakistani national after breaching border

They were pursuing a vehicle belonging to suspected drug smugglers, an official says

Islamabad, Pakistan CNN  — 

Pakistani security forces detained three Iranian border guards Monday after officials say they illegally entered Pakistan’s southwestern Balochistan province and opened fire on a vehicle, killing one person.

“The Iranians entered Pakistan in pursuit of a vehicle belonging to drug smugglers,” said a security official, who asked not to be named because he is not authorized to speak to the media.

The person killed was a Pakistani national, according to Saeed Ahmed Jamali, the deputy commissioner of Washuk district. One other person was injured in the shooting.

Jamali said the Iranians breached the Pakistani border by three kilometers, or roughly two miles.