FILE - An Iranian border guard is seen on patrol near Taibad in eastern Iran, June 1, 2014.
FILE - An Iranian border guard is seen on patrol near Taibad in eastern Iran, June 1, 2014.

Ten Iranian border guards were killed and three others were wounded Wednesday in a "terrorist attack" launched from inside Pakistan, Iranian state media said.

The border guards were patrolling in Mirjaveh in Sistan-Baluchestan province, southeastern Iran.

The militant group called Jaish-ul-Adl, or the Army of Justice, claimed responsibility for the attack, the state media said.

Sistan-Baluchestan province has long been plagued by unrest from both drug-smuggling gangs and separatist militants. The population of the province is predominantly Sunni Muslim; the majority of Iranians are Shi'ite.

Eight Iranian border guards were killed in clashes with Sunni rebels in 2015. Two years earlier, Jaish-ul-Adl killed 14 border guards in an attack

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