Four individuals lost their lives and 14 others were injured in an attack at the Turkish Aerospace Industries’ headquarters on Wednesday, according to government reports. Witnesses described hearing gunfire and a loud explosion near Ankara.

Interior Minister Ali Yerlikaya confirmed that two assailants were killed in what he termed a terrorist attack, noting that three of the injured are in critical condition. Television broadcasts previously aired footage of armed attackers entering the TUSAS building.

“Two terrorists were neutralised in the terror attack on the TUSAS Ankara Kahramankazan site. Sadly, we have 3 martyrs and 14 wounded in the attack,” Yerlikaya said, referring to the Aerospace Industries.

Turkish President Tayyip Erdogan, alongside Russia’s Vladimir Putin at a BRICS conference in the Russian city of Kazan, also called it a terrorist attack.

Some media reports claimed a suicide attack had occurred and that there were hostages inside the building, though officials have not confirmed this.