MOSCOW (AP) — The Russian Defense Ministry said that two volunteer soldiers fired at other troops at a Russian military firing range near Ukraine, killing 11 and wounding 15 others, before getting killed.

The ministry said in a statement that the shooting took place in the Belgorod region in southwestern Russia that borders Ukraine. It said that the two volunteers from an unnamed ex-Soviet nation fired on other soldiers during target practice and were killed by return fire.

The ministry called the incident a terrorist attack.