Four border guards were injured in a booby trap car bomb near the Mirjaveh border with Pakistan in Iran’s Baluch populated southeast.

According to state news agency IRNA, the condition of three of the injured is stable, but one was transferred to the provincial capital Zahedan for treatment.

Haalvsh website, which covers the events in Sistan-Baluchestan province, earlier reported that a military vehicle was targeted by an explosion in the Shahrak area of the border town of Mirjaveh.

It quoted local sources as saying that the situation is tense, and said military vehicles are patrolling the city. No group has yet claimed responsibility for the explosion.

Last week, an attack on a police station in the Sunni majority city of Zahedan claimed the life of two policemen. According to Iranian law enforcement officials, four gunmen who used hand grenades were also killed.

Tensions in Sistan-Baluchestan have been high since security forces, under the command of the Revolutionary Guards, killed an estimated 80-90 civilian protesters in the city on September 30, which became known as Black Friday.