Turkey’s military says suspected Kurdish militants have fired two mortar rounds at a military base in the country’s southeast region, prompting the military to fire back in retaliation.

A statement posted Monday on the military’s website says no one was injured in Sunday’s attack on the base in Hakkari province, close to Turkey’s borders with Iraq and Iran.

The exchange of fire comes despite a peace process between Turkey and the rebel group, PKK, aimed at ending a conflict which has killed tens of thousands of people since 1984.

Turkey’s president and prime minister are scheduled to inaugurate a new airport in Hakkari on Tuesday.