The headquarters of Turkey's state-owned Turkish Aerospace Industries near Ankara has been hit by a deadly "terrorist attack," an official says.

Turkish President Recep Tayyip Erdoğan has reported that four people have been killed in a terrorist attack in Ankara province at the Turkish Aerospace Industries plant, which also produces military equipment.

At least five people have been killed and 22 others wounded in an attack at a Turkish aviation firm, in what Ankara called a terrorist attack.Witnesses heard gunfire and an explosion as TV broadcasters showed footage of two attackers carrying assault rifles and backpacks entering the TUSAS building near Ankara.