The blast ripped through a training facility Tuesday in the western city of Khoramabad. Iran's official English language news service Press TV quoted Yadollah Boual, the elite force's deputy commander in the local province, saying that the explosion was caused by a fire that spread to an ammunition storage area.
Last month, a bomb went off during a parade by the army and Revolutionary Guard in the ethnic Kurdish city of Mahabad, killing 12 people and injuring 80. No group claimed responsibility for the attack, but authorities blamed "anti-revolutionary" militants backed by foreign powers, noted The Washington Post, and said they killed 30 rebels responsible for the attack.
Tehran has repeatedly accused the U.S. and Britain of sponsoring militant ethnic groups, with the aim of destabilizing the country.