UN Secretary General Ban Ki-moon said on Wednesday there were "many details to work out" before a ceasefire could be reached to end the conflict between Israel and Palestinian militants in the Gaza Strip.

"I am particularly concerned about the spiral of violence at the time of intense efforts to reach a ceasefire in Gaza and Israel," Ban said.

Speaking after a meeting with Egyptian President Mohamed Morsi, whose country is trying to forge a truce, he said: "We all know there are many details to work out. But while that happens civilians continue to die."

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