Turkish artillery fired into ISIS-held territory in Syria on Thursday, killing four militants, in retaliation to cross-border rockets that left several Turks wounded, security sources and media said.
A salvo of rockets fired by ISIS from Syria struck a residential area of the town of Kilis earlier in the day, its mayor, Hasan Kara, said.
The private Dogan News agency said one policeman was among the wounded and broadcast images of damaged buildings and vehicles.
The Turkish armed forces fired howitzers at two targets on the Syrian side, Dogan said, citing the military.
Kilis, which stands on the border in southern Turkey and is home to a significant Syrian refugee population, has been repeatedly targeted by ISIS barrages which have killed around 20 people and injured scores since the start of the year.
NATO member Turkey is part of the U.S.-led coalition fighting ISIS. It has routinely returned fire, destroying gun positions and killing 370 jihadists, the state-run Anadolu Agency said.
Turkish President Recep Tayyip Erdogan warned ISIS on Wednesday that no attack on Turkey would go unanswered.