UNITED NATIONS (AP) — The U.N.'s Middle East envoy said there was no justifying the killings of more than 50 Palestinians by Israeli fire at the Gaza border, and several Security Council members called for an independent investigation, but the council had no unified message Tuesday as the U.S. said Israel had acted with "restraint."

While some members said the U.N.'s most powerful body needed to speak as one to try to calm the volatile situation — and the Palestinian envoy implored, "When are you going to act?" — a proposed statement had stalled Monday after the U.S. blocked it.

Still, Kuwait'...