Israeli jets have attacked several sites in the Gaza Strip, sources on both sides said, hours after a rocket from the Palestinian enclave hit the Jewish state.

Palestinian medical and security sources on Sunday said five sites in northern and southern Gaza were hit, including training camps for the Islamic Jihad and Ezzedine al-Qassam Brigades, Hamas's military wing.

Al Jazeera's reporters in Gaza said no injuries were reported by the Palestinians. The Israeli army said it retaliated to "ongoing rocket attacks from Gaza", targeting four sites in northern Gaza and a fifth in the south of the coastal territory.

On Saturday night, a rocket fired from Gaza hit an open area near Ashkelon in southern Israel without causing damage or injuries, the army and police said.

According to the Israeli army, 82 rockets have been fired from Gaza since the beginning of March.

Four rockets hit Israel on Thursday, shortly after it called off the planned release of 26 Palestinian prisoners.

PHOTO CAPTION

Palestinians inspect the rubble of a destroyed metal workshop after it was hit by an Israeli missile strike in Jabaliya refugee camp, in the northern Gaza Strip, Friday, April 4, 2014.

Al-Jazeera