UN Secretary-General Ban Ki-moon has told Israel's prime minister he is disappointed that a Security Council resolution calling for a ceasefire in Gaza has so far been ignored.

In a telephone call to Prime Minister Ehud Olmert, Mr Ban "expressed disappointment that the violence is continuing on the ground in disregard of yesterday's Security Council resolution," UN spokeswoman Michele Montas said.

Mr Olmert earlier dismissed the resolution calling for an "immediate and durable" ceasefire in the two-week-old war as "unworkable" and warplanes and tanks continued to pound the Palestinian enclave.

Officials of the Hamas Islamist movement that runs Gaza said they were weighing the UN resolution but objected that they had not been consulted. Israel said Palestinian militants continued to fire rockets at Israeli territory.

Senior UN officials have no direct contacts with Hamas but Ms Montas said Mr Ban would "definitely" convey the same message to the militant grouping indirectly. She declined to say what channels he would use.

UN humanitarian affairs chief John Holmes earlier said it was "extremely disappointing" that a ceasefire had not taken hold in Gaza.

"It is a reasonable expectation on our part that the parties should comply with that resolution and I hope they will do that in the very near future," Mr Holmes said.

"What we still desperately need is a full, lasting ceasefire so that we can do what we need to do to protect civilians because civilians are not safe anywhere in Gaza until there is a full ceasefire."

The resolution was the result of lengthy haggling between Western and Arab states. It was passed by 14-0 in the Security Council, with the United States abstaining.

Apart from a ceasefire, it also called for the reopening of border crossings into Gaza and for the unimpeded distribution of aid in the territory.

The fighting has now killed more than 788 Palestinians and at least 14 Israelis.

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