ANKARA, TURKEY, JAN. 18 -- U.S. warplanes based at a Turkish air base bombed targets in Iraq early this morning, Western diplomats said, sparking a dispute over the nature of their mission and reportedly reviving longstanding tensions between President Turgut Ozal and his military command.

Hours after the Turkish parliament granted war powers to Ozal's government and authorized U.S. planes to launch offensive strikes from Incirlik air base, near the southeastern city of Adana, Turkish journalists reported between 25 and 30 U.S. planes taking off at 1:30 a.m. from the base and landing there three hours later. The parliament's action overrode portions of a treaty between Turkey and the United States that said the base could only be used for NATO operations.

Turkey's Foreign Ministry initially described the operation as a "night training mission," and a U.S. Air Force spokeswoman declined to comment on "operations at this time."

But Western diplomats confirmed that the aircraft bombed targets in Iraq. They said some of the planes refueled at another NATO air base at Batman, less than 90 miles northwest of Turkey's 206-mile border with Iraq; Incirlik is 440 miles from the frontier.

Turkish newspapers reported that the planes had attacked Iraqi mobile missile launchers.

By late afternoon, the Foreign Ministry said U.S. use of Turkish bases had been "expanded," while insisting that Turkey did not intend to attack Iraq unless attacked itself.

Appearing on television tonight, Ozal reasserted that the U.S. planes had been on a training mission, then said that they "might have gone on."

Apparently angered by the changing government descriptions of the raids, the Turkish general staff issued an unusually blunt statement denouncing government efforts to make the military assume responsibility for deciding what role the Turkish-based planes may play in the U.S.-led war against Iraq.

Coming six weeks after Gen. Necip Torumtay, chief of Turkey's general staff, resigned in reported protest against being largely cut out of negotiations on military cooperation with the United States, the military command's statement appeared to be another warning of displeasure with Ozal's Persian Gulf policy.

The general staff's principal objection appeared to be the Ozal-dominated cabinet's decision Thursday night to make the military command responsible for approving the use of Turkish bases for American strikes against Iraq. Government spokesman Mehmet Yazar announced that "we don't have to wait for an attack to use foreign forces at the bases because the Turkish general staff has been given the required instructions regarding the bases."

The general staff responded with a statement saying it "has been given no authority to authorize or prevent United States aircraft based at Incirlik from taking off."

"In no democratic country in the world does a general staff have such authority," it added. "Traditionally, the government gives the Turkish general staff an order and the {general staff} operates accordingly."

Informed sources said that a number of key generals held a long meeting Thursday night. After midnight, according to the semiofficial Anatolia news agency, the Turkish air force commander, Gen. Siyani Tastan, and Gen. Dogan Gunes, Torumtay's successor as chief of staff, consulted first with Prime Minister Yildirim Akbulut and later with Ozal.

Particularly angering the Turkish military, informed sources said, was Ozal's reported determination to involve Turkey in the war in apparent violation of a Turkish policy of "peace at home, peace with the world," first voiced by Mustafa Kemal Ataturk, founder of the modern Turkish state. Turkey has been a staunch member of NATO, guarding the alliance's southern flank against the Soviet threat for more than 40 years, but traditionally has wanted no part in its Arab neighbors' often-turbulent politics.

There have long been tensions between Turkey's civilian government and its armed forces, which have seized power three times since 1960. The most recent coup was staged in 1980; after two years, the military returned power to a civilian government.

Meanwhile today, Western diplomatic sources reported the arrival of 48 additional American fighter aircraft at Incirlik. That doubling of the number of foreign planes allowed at the base was authorized Sunday when Ozal met Secretary of State James A. Baker III here.

Anatolia reported that the number of Iraqi soldiers fleeing across the Turkish border reached 28 today. A Turkish official said 10 soldiers took refuge in police stations.