The Obama administration is warning Iran and Syria that America's commitment to Israel's security is unshakeable and that they should understand the consequences of threats to the Jewish state.

Previewing a speech Secretary of State Hillary Rodham Clinton is to deliver later Thursday, the State Department said the transfer of increasingly sophisticated weaponry, including rockets, to anti-Israel militants in southern Lebanon and Gaza could spark new conflict in the Middle East.

Clinton's address is the latest in a series of moves the administration is making to reassure Israel that its ties to the United States remain strong despite tensions that flared last month. She will say the U.S. is determined to pursue an Israeli-Palestinian peace deal and is hoping to restart indirect talks between the two sides in the near future.