An Israeli air strike killed four Palestinians in Gaza on Tuesday, the territory's civil emergency service said, as Arab mediators and the United States tried to hammer out differences between Hamas and Israel over the Jan 19 ceasefire agreement.

Israeli fire has killed four people and wounded 14 in the Gaza Strip over the past 24 hours, Palestinian officials said, even as a fragile ceasefire with Hamas has largely held.Israeli strikes have killed dozens of Palestinians who the army says had approached its troops or entered unauthorized areas in violation of the January truce.