after the first major cross-border clashes between Turkey and ISIS Thursday left one Turkish soldier and one militant dead, thrusting Turkey into open conflict with the Islamists.

Earlier in the day, TRT television said four military jets took off from Diyarbakir air base in southeast Turkey and used missiles to hit at ISIS targets in the Syrian village of Havar. The village is across the border from the Turkish province of Kilis. TRT said the planes did not violate Syrian airspace.

Private NTV television said at least three loud explosions could be heard from Kilis.

Meanwhile, a government official told the Associated Press that three F-16 jets took off from Diyarbakir airbase in southeast Turkey early Friday and used smart bombs to hit three ISIS targets across the Turkish border provinceof Kilis. The official, who spoke on condition of anonymity because of government rules requiring prior authorization for comment, said the targets were two command centers and a gathering point of ISIS supporters.

Also read: Turkish police raid suspected ISIS, PKK militants in Istanbul



On Thursday, five ISIS militants fired from Syrian territory at a Turkish military outpost, killing one soldier and prompting Turkish retaliation that killed at least one ISIS militant.



The operation also comes a day after U.S. officials said Turkey had agreed to allow the U.S. access to a key Turkish air base for use against the extremist group.



Earlier in the week, a suicide bombing blamed on ISIS militants killed 32 people in southeastern Turkey, near the Syrian border.



Turkish officials have raised concerns that the bombing was part