Turkish soldiers, air force bombers and helicopter gunships launched an incursion into northern Iraq on Wednesday, hours after Kurdish rebels killed 24 soldiers and wounded 18 in attacks along the border.
Prime Minister Recep Tayyip Erdogan canceled a visit to Kazakhstan and held a nationally televised news conference to announce that Turkey had launched the "hot pursuit" operation, wording that officials often use to describe cross-border offensives in northern Iraq.
"We will never bow to any attack from inside or outside Turkey," he said.
Turkey's chief of the military and the ministers of interior and defense rushed to the border area to oversee the anti-rebel attacks, and the United States and NATO both issued statements supporting the offensive, the largest in more than three years.
NTV television said Turkish troops have gone 2 1/2 miles into Iraq and that helicopters were ferrying commandos across the border. Dogan news agency said more than 20 Kurdish rebels were killed in ensuing clashes.
The incursion appeared to be limited in scope. Turkey last staged a major ground offensive in the Iraq border area in early 2008.
Wednesday's offensive began hours after the rebels, who are fighting for autonomy in Turkey's southeast, staged simultaneous attacks on military outposts and police stations near the border towns of Cukurca and Yuksekova.
The Interior Ministry first said 26 soldiers were killed and 22 wounded, but Erdogan corrected those figures to 24 dead and 18 wounded.