(CNN) – A pair of suspected U.S. drone strikes killed four al Qaeda militants in Yemen as the United States maintained a heightened security alert in the country and urged all Americans to leave immediately.

Security sources told CNN about the strikes but didn’t offer additional details. A Yemeni official said four drone strikes have been carried out in the past 10 days.

None of those killed on Tuesday were among the 25 names on the country’s most-wanted list, security officials said.

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