Officials revealed the rescue operation a day after the militants released a video showing the beheading of Foley and threatened to kill a second hostage, Steven Sotloff, if U.S. airstrikes against the militants in Iraq continued.
Despite the militants' threats, the U.S. launched a new barrage of airstrikes against Islamic State targets in Iraq Wednesday. The Obama administration did not rule out the prospect of a military operation in Syria to bring those responsible for Foley's death to justice.
Disclosure of the rescue mission marks the first time the U.S. has revealed that American military personnel have been on the ground in Syria since a bloody civil war there broke out more than three years ago. Obama has resisted calls to insert the U.S. military in the middle of Syria's war, a cautious approach his critics say has allowed the Islamic State to strengthen there and make gains across the border in Iraq.
Caitlin Hayden, spokeswoman for the White House National Security Council, said the administration never intended to disclose the operation. But she said the U.S. went public Wednesday because a number of media outlets were preparing to report on the operation and the administration "would have no choice but to acknowledge it."
In a statement Wednesday night, Pentagon spokesman Rear Adm. John Kirby said: "As we have said repeatedly, the United States government is committed to the safety and well-being of its citizens, particularly those suffering in captivity. In this case, we put the best of the United States military in harm's way to try and bring our citizens home."
It's unclear how many Americans the special forces attempted to rescue in Syria. While the officials who described the mission would not provide an exact number, other U.S. officials, who were not authorized to speak publicly, have said Foley was one of at least four Americans held in Syria.
Like Foley, two others are believed to have been kidnapped by the Islamic State. The fourth, freelance journalist Austin Tice, disappeared in Syria in August 2012 and is believed to be in the custody of government forces in Syria.
Administration officials would not say specifically when or where the operation took place, citing the need to protect operational details in order to preserve the ability to carry out future rescue missions. They did say that nearly every branch of the military was involved and that the special forces on the ground were supported from the air by fixed wing, rotary and surveillance aircraft.
Obama has authorized previous military missions to rescue hostages. In 2009, Navy SEAL snipers carried out a daring sea operation to rescue an American ship captain held by Somali pirates in a lifeboat. And in 2012, special operations forces successfully rescued two aid workers an American and a Dane held in Somalia.
Follow Julie Pace at http://twitter.com/jpaceDC Authorities analyze voice in hunt for Foley killer
London • Experts say police and security services are using voice-recognition software and other technology, as well as human tips, as they scramble to identify the militant recorded on a video showing the killing of American journalist James Foley.
Prime Minister David Cameron has said the masked jihadi is likely British. Linguists say his accent suggests he is from the London area.
The Guardian newspaper quoted an unnamed former captive who was held in Raqqa, Syria, as saying he appeared to be one of several British militants nicknamed "The Beatles" by hostages charged with guarding Islamic State prisoners.
John O'Regan, a linguist at London's Institute of Education, said Thursday that analysts would likely make a voice print of the speaker and compare it to recordings of known suspects.