The United States has vetoed a United Nations Security Council resolution condemning an Israeli attack that killed 18 Palestinians in the Gaza Strip.
US Ambassador John Bolton said on Saturday he was "disturbed" at the draft, which he called "biased against Israel."
Four nations abstained from the vote Saturday, and 10 others backed the measure, which also called on Palestinian officials to stop rocket attacks on Israel.
The only Arab state on the council, Qatar, presented the resolution after Israel launched an artillery strike in northern Gaza Wednesday.
Israel's military says the strike was in response to Palestinian rocket attacks. But officials said technical problems caused artillery fire to hit the town of Beit Hanoun. They expressed regret at civilian deaths.
Palestinian officials have called the incident a war crime.
Israel first launched its Gaza offensive after Palestinian gunmen captured an Israeli soldier in a cross-border raid in June. The offensive has been aimed at finding the soldier, stopping Palestinian rocket attacks, and locating tunnels where weapons are smuggled into Gaza. More than 50 Palestinians were killed in the latest phase of the offensive.