Two US warplanes briefly violated Turkish airspace near Iraq last week, the military General Staff revealed today.
The incident comes amid mounting speculation over a possible Turkish troop incursion into Kurdish northern Iraq to crush Kurdish militants hiding there. Washington has repeatedly cautioned Turkey, a Nato ally, against such a move.
"Two F-16s belonging to the United States violated Turkish airspace in the southeast region of Anatolia for a period of four minutes (on May 24th)," the General Staff said.
Turkey's Foreign Ministry has been notified about the incident, it said.
Kathryn Schalow, spokeswoman for the US embassy in Ankara, said: "It seems to have been an accident. An investigation has been opened on the matter."
Turkish newspapers said the airspace infringement may have been intended as a message to Turkey not to send troops into Iraq against rebels of the banned Kurdistan Workers Party (PKK).
The top-selling Hurriyetnewspaper described the incident as "a challenge" that showed US forces were closely monitoring Turkish troop movements along the Iraqi border.
Ankara has long urged US and Iraqi government forces to crack down on an estimated 4,000 PKK guerrillas who use the mountains of mainly Kurdish northern Iraq as a springboard to attack military and civilian targets inside Turkey.
Last Tuesday, a suicide bomber killed six people in Ankara in an attack blamed by Turkish authorities on the PKK. The group denied responsibility. The attack has added to political tensions in Turkey as it gears up for July general elections.