"We are open to ways to assure a credible investigation, including international participation," White House spokesman Robert Gibbs told a news conference Tuesday.
Israel's government has rejected calls for international involvement in investigating the incident. "We have total confidence in our own investigation, which has all the features of a professional and independent investigation comparable with other NATO countries," the Israeli prime minister's spokesman, Mark Regev, said.
But Regev said there's a double standard involved. "When other NATO nations have been involved in conflict situations abroad, and there have been casualties in the local population, no one has demanded an investigation. This is a double standard that has only been applied to Israel," he said.
The government will not set up an outside investigative committee to review the military's operation; the IDF itself will head the investigation. This is a standard matter of protocol in Israel.