A Turkish policeman watches over a protest against the Kurdistan Workers Party (PKK) on October 9, 2011, at Gemlik in Bursa.
Turkey sent soldiers, bomber planes and helicopter gunships into Iraq on Wednesday, reports the Associated Press.
Authorities have not confirmed the operation, but local media reports say that Turkish troops have gone roughly 2.5 miles across the border.
More from GlobalPost: Turkey: Military killed up to 100 PKK rebels
Both airstrikes and ground troops were deployed early on Wednesday morning in the Qandil mountains in northern Iraq, according to Al Jazeera.
Soldiers have already killed 15 Kurdish rebels in clashes on the Turkish side of the border, reports Reuters, citing security sources.
They were responding to simultaneous attacks on police and army posts, carried out overnight in several locations in the predominantly Kurdish province of Hakkari in south-east Turkey.
More from GlobalPost: Turkish jets bomb PKK bases in northern Iraq
Kurdish separatist group PKK, the Kurdistan Workers' Party, was responsible for the attacks, according to a Turkish security source.
At least 26 soldiers died in the attacks, making them the deadliest on the Turkish military in almost 20 years, the BBC reports.
The governments of Turkey and Iraq have an agreement that allows the Turkish military to make "hot-pursuit" operations into Iraq, says Al Jazeera.
Turkish President Abdullah Gul pledged that Turkey would make the firmest possible response:
"No one should forget that those who make us suffer this pain will be made to suffer even stronger. They will see that the vengeance for these attacks will be immense."
More from GlobalPost: Ahead of elections, Turkey's Kurds step up demands for reform
Without federal support, local stations, especially in rural and underserved areas, face deep cuts or even closure. Vital public service alerts, news, storytelling, and programming like The World will be impacted. The World has weathered many storms, and we remain steadfast in our commitment to being your trusted source for human-centered international news, shared with integrity and care. We believe public media is about truth and access for all. As an independent, nonprofit newsroom, we aren’t controlled by billionaire owners or corporations. We are sustained by listeners like you.
Now more than ever, we need your help to support our global reporting work and power the future of The World.