Executives at the international satellite broadcaster said they made the decision after a weekend of deliberations to protect the impartiality of the station's news report.

"The conflict in Gaza forms part of one of the most challenging and contentious stories for any news organization to cover," said Sky News director John Ryley. "Our commitment as journalists is to cover all sides of that story with uncompromising objectivity."

The ad was submitted for broadcast by the Disaster Emergency Committee, a group of charities that includes the Red Cross, Oxfam and Save the Children.

Ian Bray, a committee spokesman, said the appeal will be broadcast Tuesday evening by other British channels, including ITV, Channel 4 and Channel 5. He said it will be between two and three minutes long and that the piece would not assign blame for the conflict but simply say the people of Gaza need help.

He said he has not seen it yet because the actual spot is produced and scripted by the news channels, not the charities. It will include a telephone number and Web site people can use to make donations, he said.

Protesters say the humanitarian appeal must be shown on Sky and BBC to help Palestinians in desperate need of assistance after heavy fighting in Gaza.