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ISIS hostage Kayla Jean Mueller's family hopeful she's still alive

U.S. officials say there is no evidence the hostage was killed
U.S. officials say there is no evidence the h... 02:46

PRESCOTT, Arizona -- The parents of a 26-year-old American who Islamic extremists say was killed in an airstrike in Syria said in a statement addressed to group leaders that the claim of their daughter's death concerned them but they were still hopeful she was alive.

For a second day in a row, Jordanian fighter ... 02:06

The Islamic State of Iraq and Syria, or ISIS, said on Friday that Kayla Jean Mueller of Prescott, Arizona, died in a Jordanian airstrike, but the government of Jordan dismissed the statement as "criminal propaganda," and the U.S. said it had not seen any evidence to corroborate the report.

Mueller is the only known remaining U.S. hostage held by the group.

If the death is confirmed, she would be the fourth American to die while being held by ISIS militants. Three others - journalists James Foley and Steven Sotloff and aid worker Peter Kassig - were beheaded by the group.

"You told us that you treated Kayla as your guest, as your guest her safety and well-being remains your responsibility," Mueller's family said in a short statement released Friday.

ISIS claims that Jordanian airstrikes have ki... 02:23

Mueller is an aid worker who previously volunteered with organizations in India, Israel and the Palestinian territories. Her identity had not been disclosed until now out of fears for her safety. Her family said she was taken hostage by ISIS on Aug. 4, 2013, while leaving a hospital in Syria.

"The common thread of Kayla's life has been her quiet leadership and strong desire to serve others," Mueller's family said.

ISIS has lied before about the fate of its hostages, CBS News correspondent Charlie D'Agata reports from the Jordanian capital of Amman.

Jordan has been launching airstrikes against the extremist group in response to a video released this week that shows captive Jordanian pilot Lt. Muath al-Kaseasbeh being burned to death in a cage. His F-16 came down in December while conducting airstrikes as part of a campaign against the militants by a U.S.-led coalition.

CBS News national security analyst Juan Zarat... 03:34

Jordanians were led to believe their pilot was alive after ISIS offered a prisoner exchange this week, only for intelligence analysts to conclude that he was likely executed weeks ago, D'Agata reports.

His gruesome killing sparked an unprecedented backlash in Jordan, where thousands filled the streets, chanting "Death to ISIS." Jordan's Queen Rania took part too, saying the country was united in grief and pride.

The Arab country said it is now going after ISIS with everything it has, and the unproven claim of Mueller's death will likely do nothing to stop the punishing bombardment, D'Agata reports.

ISIS said in a statement Mueller was killed in the militants' stronghold of Raqqa in northern Syria during midday prayers in airstrikes that targeted "the same location for more than an hour."

It published photos purportedly of the bombed site, showing a severely damaged three-story building, but offered no proof or images of Mueller.

The statement said no ISIS militants were killed in the airstrikes, raising further questions about the veracity of the claim.

The Jordanians are working very closely with U.S. forces, and all targets go through a careful vetting process first, D'Agata reports. The Pentagon said that building was thought to be holding weapons and there was nothing to suggest that it was holding hostages.

Jordanian government spokesman Mohammed al-Momani said it was investigating.

"But as a first reaction, we think it's illogical and we are highly skeptical about it. How could they identify a Jordanian warplane ... in the sky? What was the American lady doing in a weapons warehouse?" al-Momani said.

"It's part of their criminal propaganda. They have lied that our pilot is alive and tried to negotiate, claiming he is alive while they had killed him weeks before," he added.

American officials said they also were looking into the report.

Bernadette Meehan, spokeswoman for President Obama's National Security Council, said the White House has "not at this time seen any evidence that corroborates" the claim.

"We are obviously deeply concerned by these reports," she added.

A U.S. official said coalition aircraft did conduct bombing near Raqqa on Friday, but he had nothing to confirm the claim that the American captive was killed in the airstrike. He spoke on condition of anonymity because he wasn't authorized to discuss the issue with reporters.

Mueller had been working in Turkey assisting Syrian refugees, according to a 2013 article in The Daily Courier, her hometown newspaper. She told the paper that she was drawn to help with the situation in Syria.

"For as long as I live, I will not let this suffering be normal," she said. "It's important to stop and realize what we have, why we have it and how privileged we are. And from that place, start caring and get a lot done."

According to the newspaper, Mueller had been working with the humanitarian aid agency Support to Life, as well as a local organization that helped female Syrian refugees develop skills.

On Sunday, Mr. Obama said the U.S. was "deploying all the assets that we can" to find Mueller.

"We are in very close contact with the family trying to keep them updated," he said in an interview with NBC's "Today" show. "Obviously this is something that is heartbreaking for the family, and we want to make sure we do anything we can to make sure that any American citizen is rescued from this situation."

The Jordanian government said dozens of its fighter jets had bombed ISIS training centers and weapons storage sites.

Activists who monitor the Syrian conflict from inside the country said coalition planes hit several targets on the edges and outskirts of Raqqa in quick succession Friday.

A Raqqa-based collective of anti-ISIS activists known as "Raqqa is Being Slaughtered Silently" said the planes targeted multiple ISIS positions and headquarters in the western and eastern countryside of Raqqa, sending up columns of smoke. Explosions could be heard in the city.

The collective said 47 ISIS members were killed. It was not clear how the activists obtained the information, which could not be independently verified.

The Britain-based Syrian Observatory for Human Rights also said "dozens" of ISIS members were killed in coalition airstrikes that targeted a tank and vehicle depot in the area of al-Madajen and at least six other ISIS positions, including a training camp and a prison.

The Raqqa-based activists and the Observatory both said coalition airstrikes on Raqqa resumed on Saturday, with explosions shaking an ISIS headquarters known as Division 17 in the city's northern countryside and an ISIS camp known as al-Saeqa to the West.

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