ISTANBUL — Fighting between the Turkish military and Kurdish rebels escalated Tuesday amid signs of unease from NATO allies attending an emergency meeting about Turkey’s conflicts with the Islamic State group and the Kurds.

On a violent day, Turkish fighter jets pounded rebels from the Kurdistan Workers Party, or PKK after soldiers were fired on with heavy weaponry in Sirnak province, according to a military statement. Turkish soldiers also came under attack in two other incidents.

Meanwhile, NATO allies met in a rare emergency meeting at Turkey’s request and proclaimed “strong solidarity” with the country’s fight against the Islamic State group.

“The security of the alliance is indivisible,” ambassadors from all 28 NATO nations declared in a joint statement after the meeting.

But a NATO official said members also used the closed-door meeting to call on Turkey not to use excessive force in reaction to terror attacks, while urging it to continue peace efforts with representatives of the Kurdish minority. The official was not authorized to speak on the record and spoke on condition of anonymity.

The special session of the alliance’s main political decision-making body, the North Atlantic Council, was held at Turkey’s request under a clause of NATO’s founding treaty that empowers member countries to seek consultations if they believe their security, territorial integrity or political independence is at risk. It was called after Turkish warplanes last week started striking militant targets in Syria in response to an Islamic State group suicide bombing in southern Turkey that left 32 people dead, and another IS attack on Turkish forces, which killed a soldier. But in a series of cross-border strikes, Turkey has also targeted Kurdish fighters affiliated with forces battling IS in Syria and Iraq.