From Yahoo News/AP:
JERUSALEM – Israel successfully tested an anti-missile system designed to protect the country against Iranian attack, the Defense Ministry said, perfecting technology developed in response to failures of similar systems during the 1991 Gulf War.
The intercept of a dummy missile was the 17th test of the Arrow system, a U.S.-Israeli joint venture. Israeli defense officials said the interceptor was an upgraded Arrow II, designed to counter Iran's Shahab ballistic missile.
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My Comment: I guess the Israelis do not have confidence with the American anti-missile and/or the American Administration's support of it. Hence their own system.