"I strongly condemn the horrific attacks at Istanbul's Ataturk Airport. My thoughts are with the families of the victims, those injured and the people of Turkey," he said in a statement.

"There can be no justification for terrorism. NATO Allies stand in solidarity with Turkey, united in our determination to fight terrorism in all its forms," he said.

The North Atlantic Treaty Organization (NATO) is an alliance of 28 countries from North America and Europe committed to fulfilling the goals of the North Atlantic Treaty signed on 4 April 1949. Turkey is a member of NATO.