Air Force jets bombed three Hamas targets in the Gaza Strip, in response to the five mortar shells fired at the Negev Wednesday, in which one Israeli was wounded.
No injuries were reported on the Palestinian side.
The IDF Spokesperson's Office said the targets included a weapons storeroom in the northern Strip and two areas of terror activity in the south.
Direct hits were identified, the IDF stated, adding that the strike was a response to recent fire and that the army sees Hamas as responsible for all that goes on in Gaza.
An Israeli man sustained light wounds Wednesday night when a mortar fired from northern Gaza exploded in the western Negev's Eshkol Regional Council.
The man was evacuated to the Soroka Medical Center in Beersheba with injuries to his upper body after he was treated by IDF forces at the scene.
Council officials said a total of five shells were launched from the Hamas-ruled territory, adding that residents in the area were instructed to enter secure rooms.
Earlier Wednesday, a mortar fired from Gaza landed near a kibbutz in the western Negev, damaging a home. There were no reports of injury.
IDF Chief of Staff Lt.-Gen. Gabi Ashkenazi told paratroopers from the 202nd Battalion on Wednesday that "the situation in Gaza is volatile these days."
"We've witnessed deterioration and the planting of numerous bombs along the border," he said. "There will be more incidents here; the fighting near the security fence will continue and we must be prepared, perhaps to operate on a broader level.
"The next round (of fighting) will be extensive and it should end in such a way where there is no doubt as to which side triumphed," the army chief told the soldiers.