Gaza City: Six people have been killed and several injured after an air strike on a in Gaza that reduced a building to rubble on Wednesday morning.

Two women and two children were among the people killed in the attack.

Israel says it had targetted Mohammad Deif, leader of the governing Hamas movement's armed wing and Israel's most wanted man.

"We know he was injured, but not to what degree," said an army spokeswoman.

However a spokesman for Hamas's Izz El Deen Al Qassam Brigades denied Deif, who has survived several Israeli assasination attempts, had been hurt in the raid.

He said: "We deny it ... This is only a cover-up for the massacre of Palestinian civilians committed by the Zionist enemy."

The air strikes came at the same time as Israeli forces broadened their offensive by sending dozens of armoured vehicles into central Gaza.

Israeli security sources also say that militants have sent shells into northern Israel from Lebanon, causing one casualty in the town of Shlomi.

Israel has already killed more than 65 Palestinians in the operation to free kidnapped soldier Corporal Gilad Shalit.