Defense Secretary Leon Panetta says the U.S. is working with the British and Algerian governments to assess what's happening on the ground at a natural gas complex in the Sahara where Islamic militants are holding hostages from at least 10 countries.

U.S. Secretary of Defense Leon Panetta (Scott Olson, Getty Images)

The fate of many of the captives remains uncertain.

Speaking in London Panetta says the U.S. is "working around the clock to ensure the safe return of our citizens."

Panetta says the terrorists should be on notice that they'll find no sanctuary in Algeria or North Africa.

He says anyone who looks to attack the U.S. will have "no place to hide."


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