Four rockets fired from Syria slammed into the southern Turkish town of Kilis on Monday, killing four Syrians including three children in the latest deadly cross-border strike to panic residents, officials said.

Four rockets fired from Syria slammed into the southern Turkish town of Kilis on Monday, killing four Syrians including three children in the latest deadly cross-border strike to panic residents, officials said.

Kilis -- the only town in Turkey where refugees from the war in Syria now outnumber Turkish locals -- has been repeatedly hit by rocket fire from areas in Syria controlled by ISIL terrorists in recent weeks.

"Four Syrians living in Kilis, including three children were killed," the Kilis governor's office said in a statement.

Five Syrians and one Turkish citizen were also wounded by the rocket fire which hit the town centre in a two-hour period from 1130 to 1330 GMT, it added.

A Syrian shepherd was among those killed when one of the Katyusha-type rockets hit an area close to a school where he was tending his flock, the Dogan news agency said.

Ten of his sheep were killed while a 14-year-old Turkish schoolboy was also wounded.

A second person was killed and four more wounded when one of the rockets hit an apartment block in another district of the town, Dogan said.

Turkish armed forces hit back by firing mortar shells at ISIL targets inside Syria, the report added.