A Turkish diplomat was among two people killed in an attack in the Iraqi Kurdish city of Irbil.
The victims are thought to be Turkey’s vice-consul in the city, along with a civilian. Turkey has already vowed to retaliate.
The diplomat was among a group of people dining at a restaurant when gunmen opened fire.
No-one has so far claimed the attack but Turkish Kurdish militants are based in the region.
In a statement on Twitter, Turkish presidential spokesperson Ibrahim Kalin said a “necessary response will be given to those who committed this treacherous attack”.
The shooting comes as Turkey continues its crackdown on Kurdistan Workers’ Party (PKK) militants in the area.
Initial reports said that three diplomats had been killed in the attack. But Kurdish internal security forces, known as the Asayish, later revised this figure to two.
More than 40,000 people have been killed in the PKK’s conflict with Turkey over Kurdish autonomy, which began in 1984.
PKK fighters use remote mountainous areas along the border between Turkey and Iraq’s Kurdistan Region as sanctuary and to stage attacks on Turkish forces.
Turkey has put pressure on Iraq’s government and the Kurdistan Regional Government to help it contain the group.