WASHINGTON - The United States said on Monday it would work with NATO ally Turkey to hold Syria accountable for what US officials believe was a deliberate act of shooting down a Turkish fighter jet.

White House spokesman Jay Carney said the United States stood in solidarity with Turkey as it investigated last Friday's downing of the Turkish jet and determined its response.

But Carney sidestepped questions about what an appropriate response might be to the incident, which has sent tensions soaring between Ankara and Damascus as Syrian President Bashar Assad seeks to put down a 16-month-old revolt.

"We will work with Turkey and other partners to hold the Assad regime accountable," Carney told reporters on board Air Force One as President Barack Obama flew to New Hampshire.

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