Presumptive Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE said the terrorist attack Tuesday at an airport in Istanbul shows that the United States needs to continue fighting to defeat the threat of terrorism around the world.

"Terrorists have struck again in the heart of one of our NATO allies — and all Americans stand united with the people of Turkey against this campaign of hatred and violence," Clinton said in a statement released Tuesday evening.

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"Already, stories of heroism on the part of Turkish police are emerging, as their quick actions to confront the suspects may have prevented an even worse tragedy."

More than 30 people were killed Tuesday, when several suicide bombers attacked the Istanbul Ataturk Airport. Many more were injured in the attack.

Clinton said the attack "only strengthens our resolve to defeat the forces of terrorism and radical jihadism around the world."

"And it reminds us that the United States cannot retreat," she continued.

"We must deepen our cooperation with our allies and partners in the Middle East and Europe to take on this threat. Such cooperation is essential to protecting the homeland and keeping our country safe. Our thoughts and prayers are with the victims, their families, and the Turkish people."