Israel attacked underground infrastructure in Gaza with fighter jets early Monday morning, the Israeli army spokesperson reported. The attack, the army said, was in response to earlier rocket fire.

Later Monday, Defense Minister Avigdor Lieberman said that Israel "destroyed a terror tunnel" in the Gaza Strip.

A rocket launched from Gaza exploded in an open territory of southern Israel's Sha'ar Hanegev regional council on Sunday night, the army said.

A rocket siren sounded in the southern Israel city of Sderot and Sha’ar Hanegev regional council.

The Sha'ar Hanegev regional council spokesperson said there were no injuries or damage caused by the rocket.

Early Sunday morning, the Israeli military said it attacked 18 Hamas targets in the Gaza Strip, the second such action by Israel in less than 24 hours. The attacks was in response to an explosive device going off on the border with Israel and to rocket fire.

A rocket fired from the Strip on Saturday hit the roof of a house in an Israeli town after sirens sounded in several communities near the border. Rocket sirens sounded multiple times during the night.

The Palestinian Health Ministry in Gaza said that two people were injured moderately as a result of the Israeli attacks and were transferred to receive medical care at a hospital in Rafah. Palestinian rescue forces, the ministry said, were scouting an area east of Rafah that they said was hit by Israeli artillery fire.

Two Palestinians were killed and two others were wounded Saturday night by Israeli shells when they approached the Gaza border, the Palestinian Health Ministry said. The two wounded Palestinians were evacuated to hospital overnight and only this morning two bodies were found in the area, east of Rafah, the ministry added. The bodies were identified as Salem Mohammed Sabah and Abdullah Ayman Sheikha, both 17, from Rafah.