Helene Cooper And Ethan Bronner Nyt News Service

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.

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.