At least 12 Turkish soldiers have been killed following an ambush by Kurdish rebels near the Iraqi border - with 32 rebels also killed, officials say.
The PKK guerrilla group claimed it had also taken "several" soldiers hostage, but this was denied by the government.
Turkish Prime Minister Recep Tayyip Erdogan has called a crisis meeting in
But the defense minister said such action would not take place "urgently".
"There are plans to cross border" but "not urgently", Vecdi Gonul said after meeting US Defense Secretary Robert Gates in
On Wednesday, MPs voted overwhelmingly in support of a motion to allow the military to launch offensives across the border, against rebels based in the remote, mountainous north of
It followed an escalation of raids by the PKK - the Kurdistan Workers' Party - as part of its armed campaign for Kurdish autonomy.
Recent attacks blamed on the group have left more than 40 Turkish soldiers and civilians dead.
Iraqi President Jalal Talabani, himself a Kurd, called on the PKK rebels to lay down their arms.
"But if they insist on continuing to fight, they should leave Iraqi Kurdistan and not create problems here," he said.
Passengers wounded
In the latest attack shortly after midnight, a large group of PKK rebels crossed the border from
The army said it sent reinforcements and helicopters to the area, fired artillery and launched retaliatory attacks in which 32 guerrillas were killed.
PKK sources confirmed the fighting, and claimed more troops were killed than the official figure of 12.
"There were clashes with the Turkish troops late last night in which we have killed at least 16 soldiers and wounded 20. We also captured several," Reuters quoted an unnamed rebel source as saying.
Not far from the scene of the fighting, a minibus was later caught in a landmine explosion, also blamed on the PKK, that injured 10 civilians, the state news agency
Thousands of Turks joined protests in several cities denouncing the attacks and calling for action against the PKK.
The prime minister said: "We are very angry."
But he said he was "resolved to deal with these matters in a cool-headed manner".
Increased pressure
About 3,000 PKK fighters are believed to be based in northern
There have been regular clashes in the area since earlier in the year, but the latest attack was one of the deadliest for some time.
The clashes will increase pressure on the government from the public and the military for a tough response, our correspondent says.
The
The White House decried the PKK's actions, saying: "These attacks are unacceptable and must stop now."
More than 30,000 people have been killed since the PKK began fighting for greater autonomy for the largely-Kurdish south-eastern
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Turkish demonstrators demanded action against the PKK