Israel's deadly commando raid on Monday on a flotilla trying to break a blockade of Gaza complicated President Obama's efforts to move ahead on Middle East peace negotiations and introduced a new strain into an already tense relationship between the United States and Israel.

Prime Minister Benjamin Netanyahu of Israel canceled plans to come to Washington on Tuesday to meet with Mr. Obama. The two men spoke by phone within hours of the raid, and the White House later released an account of the conversation, saying Mr. Obama had expressed "deep regret" at the loss of life and recognized "the importance of learning all the facts and circumstances" as soon as possible.

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