NEW YORK ( TheStreet) -- The State Department is warning western companies operating in North Africa of a possible terrorist threat to their workers and facilities.

The State Department warned on Friday that these western oil companies could become Al Qaeda targets, attacked with weapons that may have been seized by terrorists affiliated with Al Qaeda during the Libyan civil war, according to an anonymous source cited by the Associated Press.

Weapons obtained may have included shoulder-fired and surface-to-air missiles, according to the source quoted by AP.

The State Department said Friday that the U.S. Embassy in Algeria immediately alerted the potential targets after being notified of the potential threats.

The U.S. and other countries are growing more and more anxious over the alarming number of weapons that have gone missing from Libya and where they could have ended up.

Eni ( E), Total ( TOT), BP ( BP), PetroChina ( PTR), ConocoPhillips ( COP), Shell ( RDS.A) and Suncor Energy ( SU) are among the energy companies exposed to North Africa.

-- Written by Andrea Tse in New York.

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