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US Secretary of State Hillary Clinton exchanges greetings with Israeli Defence Minister Ehud Barak prior to making statement at the 2010 American Jewish Committee Meeting. Image Credit: AFP

Washington: The Obama administration on Thursday warned Iran and Syria that America's commitment to Israel's security is unshakable, and they should understand the consequences of threats to the Jewish state.

In a speech, Secretary of State Hillary Rodham Clinton said Syrian transfers of increasingly sophisticated weaponry, including rockets, to militants in southern Lebanon and Gaza could spark new conflict in the Middle East.

Additionally, she said a nuclear-armed Iran would profoundly destabilise the region.

"These threats to Israel's security are real, they are growing and they must be addressed," she said in the speech to the American Jewish Committee.

The speech was the administration's latest effort to reassure Israel that its ties to the United States remain strong despite tensions that flared last month. Clinton told the group that Israel is "confronting some of the toughest challenges in her history," particularly from Iran, Syria and groups they support like Hezbollah in Lebanon and Hamas in the Gaza Strip, and reaffirmed US determination to get them to change course.

Missile transfers

"Transferring weapons to these terrorists, especially longer-range missiles, would pose a serious threat to the security of Israel," she said.

Israel has accused Syria of providing Hezbollah with Scud missiles, which would dramatically increase the group's ability to strike targets in Israel. Syria has denied the charges.

US officials have not confirmed Hezbollah's possession of Scuds but say they are concerned about its growing arsenal of rockets and missiles.