GAZA -- A Palestinian woman was killed and four people were wounded late Tuesday in an Israeli shelling in central Gaza Strip, Palestinian medical and security sources said.

The security sources told Xinhua that Israeli tanks, positioned on Gaza-Israeli border to the east of Al-Burij refugee camp, fired two shells at a populated area on the outskirts of the camp, targeting a group of militants.

One of the shells hit a house and killed Nema Abu Said, a mother in her thirties, and wounded four others, including two children, their mother and an elderly man, the sources said.

Cross-border clashes took place between the militants and the Israeli forces in which the Palestinian fighters detonated explosives, and the clashes obstructed the ambulances from evacuating the casualties quickly, an ambulance driver said.

Israel imposed a 300-meter-wide buffer zone along its southern and western borders with Gaza. Though Hamas, which controls Gaza, maintains a cease-fire with Israel, the buffer zone witnesses violence from time to time.