It was the first time a Jordanian official disclosed publicly the numbers of US troops in the Arab kingdom, sent there in recent weeks for military exercises and other deployments.
Abdullah Ensour told reporters today that 200 of the personnel were experts training Jordanians to handle a chemical attack. The remaining 700 are manning a Patriot missile defense system and F-16 fighter jets which Washington deployed this month in case the Syrian war worsens.
Jordan is concerned its larger northern neighbor would use chemical weapons against Syrian refugee camps in Jordan and other neighboring countries, or that the stockpile may fall into the hands of al-Qaida or other militants if Syria's President Bashar Assad loses control.
Jordan hosts the largest number of more than a half million displaced Syrians, with an equal number sheltered in Turkey and Lebanon.
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Earlier this month, Washington relocated one or two patriot missile batteries to Jordan from an unspecified country in the Persian Gulf, and also deployed a squadron of 12 to 24 F-16 fighter jets.
Ensour said Jordan was caught between a rock and a hard place in the Syrian crisis, which began in March 2011 with peaceful protests and later plunged into civil war.
"If the war continues, it's a problem, and if it ends with the collapse of the regime, we also have a problem," he said, adding that the fall of Assad's regime would leave a "vacuum, whereby attacks and conflicts would persist."