The attacks occurred in Sistan-Baluchistan province which has for years faced unrest involving drug-smuggling gangs, rebels from the Baluchi minority, and Sunni Muslim extremists.

“Five member of the Islamic Revolutionary Guard Corps and the police died as martyrs during two nighttime terrorist attacks against a Guards base in Rask and a police post in Chabahar, “Majid Mirahmadi, vice-minister of the interior, told state television.

General Mohammad Pakpour, who heads the Guards’ land forces, said on television that 15 attackers were killed during clashes with security forces.

Mirahmadi said more than 10 security force members were hurt during the clashes that began yesterday evening.

The Jaish al-Adl (Army of Justice, in Arabic), claimed the attacks on its Telegram channel.

Based in Pakistan, the Sunni Muslim rebel organisation, formed in 2012, is listed as a “terrorist” group by Iran and also by the US.

Jaish al-Adl claimed an attack in December that killed 11 officers, one of the deadliest attacks in years, at a police station in Sistan-Baluchistan’s city of Rask.

The group claimed another police station attack in Rask that killed one officer on Jan 10.

A week later, Iran said it retaliated with missiles and drones against Jaish al-Adl over the border in Pakistan. Pakistan then said it carried out airstrikes against ethnic separatists inside Iran.

The rare cross-border fire added to regional tensions during the Israel-Hamas war in the Gaza Strip, but by late January the two countries sought to ease tensions.

Impoverished Sistan-Baluchistan province, which also borders Afghanistan, is one of the few mainly Sunni provinces in Shiite-dominated Iran.