Turkey's Defense Ministry said Sunday that it has launched airstrikes over the northern regions of Syria and Iraq where the ministry is targeting Kurdish groups that it believes are responsible for an attack last week in Istanbul.
The ministry said the strikes hit the bases of the Kurdistan Wokers' Party, or PKK, and the Syrian People's Protection Units or YPG.
A bomb hit central Istanbul last week, killing six people and wounding over 80.
Turkey blames the PKK and the YPG for the attack, but both groups have denied the charges.
Washington backs the YPG in its war against the Islamic State terrorist group.