FACTBOX: Developments in Gaza fighting

(Reuters) - Following are developments in the fighting in the Gaza Strip as of 1115 GMT (6:15 a.m. EST):

(* Denotes new or updated items)

* GAZA - An Israeli air strike killed three Palestinians at a United Nations school in the Gaza Strip, medical workers and U.N. officials said. Hundreds of Palestinians sought refuge at the school after fleeing fierce fighting in the north of Gaza.

* GAZA - A father and his daughter were killed by an artillery shell east of Gaza, near the border with Israel, Palestinian medical workers said.

* GAZA - The Israeli army said an officer was killed in fighting in the northern Gaza Strip. A military spokesman said the army believed the officer was killed by "friendly fire" but an investigation was under way.

KHAN YOUNIS, Gaza Strip - Israeli tanks, backed by heavy artillery fire, moved toward Khan Younis in the southern Gaza Strip, Palestinian witnesses said.

DEIR AL-BALAH, Gaza Strip - Firing from Israeli naval ships killed 10 Palestinians in Deir al-Balah in the central Gaza Strip, medical workers said. Witnesses said ships had fired shells toward a beach in the area.

GAZA - Another 10 Palestinians were killed elsewhere in the Gaza Strip, including eight in the north of the enclave where Israeli soldiers and Hamas militants fought fierce battles on Monday.

GAZA - The Islamic Jihad said two of its fighters were killed in fighting with Israeli soldiers east of the Gaza Strip.

GAZA - Israeli army says more than 130 militants have been killed since the start of the ground offensive on Saturday.

GAZA - Death tolls since December 27: At least 574 Palestinians, three Israeli civilians and six Israeli soldiers. Toll for Palestinians excludes Israeli army reports of some 130 militants killed in fighting.

SOUTHERN ISRAEL - Palestinian militants fired more than five rockets toward Israel on Tuesday. Three-year-old suffers light shrapnel wounds when a rocket slams into a house.

(Jerusalem Newsroom)