(Adds Fatah militants wounded in shooting)

By Nidal al-Mughrabi

GAZA, March 28 (Reuters) - Gunmen shot and wounded a senior Hamas commander, his wife and two of their children in an ambush in Gaza on Wednesday which the Islamist group blamed on fighters from Fatah, its partner in a new Palestinian unity government.

Fatah did not immediately comment on the accusation but said four of its gunmen were wounded in a subsequent shooting attack by Hamas's Executive Force.

Gaza residents feared the latest factional fighting could escalate despite pledges by the power-sharing administration to end clashes in which some 90 Palestinians have been killed over the past three months.

In a separate incident in the northern Gaza Strip, Israeli ground forces fired at and hit "three terrorists who had two rocket launchers" near the border fence, an Israeli army spokesman said.

A hospital official said four people were wounded in the Israeli attack, two of them seriously.

In Gaza City, Iyad a-Shinbari, head of Hamas's armed wing in the town of Beit Hanoun, and his family were ambushed in their car by gunmen who opened fire from another vehicle, Hamas officials said.

Hospital officials said Shinbari suffered moderate wounds but his wife and the two children were in a critical condition.

Sources in Hamas said its armed wing, the Izz el-Deen al-Qassam brigades, had tracked down the car involved in the attack and seized its passengers. The sources did not disclose how many suspects were being held.

Three people have been killed in internal violence in the Gaza Strip since the unity government was inaugurated earlier this month.

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