11 February 2015 Last updated at 00:42

Last US Islamic State hostage Kayla Mueller confirmed dead


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Kayla Mueller's aunts: ''Kayla has touched the heart of the world... the world grieves with us''

Islamic State





The US has confirmed the death of aid worker Kayla Mueller, the last American hostage known to be held by Islamic State (IS) militants in Syria.
Her family said they were "heartbroken" to learn the news, and released a letter written during her captivity.
Paying tribute to her, President Obama said "she represents what is best about America".
Islamic State said she had died in a Jordanian air strike, but the Pentagon says there is "no doubt" IS killed her.
US Navy Rear Admiral John Kirby added that officials have not learned yet how Kayla Mueller died.
"Let's not forget in whose hands this woman died. And let's not forget who's ultimately responsible for it," he said.
Jordan also denied that Ms Mueller had been killed in air strikes launched following the burning alive of captured Jordanian pilot Moaz al-Kasasbeh by IS.
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President Obama: "We always devote enormous resources to freeing captives or hostages anywhere in the world"

Ms Mueller, 26, was abducted while working in Aleppo, Syria in 2013.
"Our hearts are breaking for our only daughter, but we will continue on in peace, dignity, and love for her," her family said in a statement.
In a letter written in 2014, Ms Mueller tries to reassure her family, saying that she had been treated with "utmost respect + kindness".
"I could only but write the letter a paragraph at a time, just the thought of you all sends me into a fit of tears," she wrote.
"I know you would want me to remain strong. That is exactly what I am doing."
'Legacy endures'
Ms Mueller's death was determined after her family was contacted privately by her IS captors over the weekend, with US intelligence then confirming the details of the message.
"She has been taken from us, but her legacy endures, inspiring all those who fight, each in their own way, for what is just and what is decent," President Obama said in a statement.
"No matter how long it takes, the United States will find and bring to justice the terrorists who are responsible for Kayla's captivity and death."
In an interview with BuzzFeed News, the president also rejected the suggestion that the US could have done more to free Ms Mueller.
Mr Obama said that he had launched a rescue operation in 2014 to free Ms Mueller and other hostages but that it had "missed them by a day or two".
He added: "We devoted enormous resources and always devote enormous resources to freeing captives or hostages anywhere in the world."
 80913811 muellerfamilyphoto - Last  Islamic  State  Hostage  Kayla  Mueller dead The Muellers released new photos of their daughter after her death was confirmed
 80915748 025751296 1 - Last  Islamic  State  Hostage  Kayla  Mueller dead Ms Mueller studied at Northern Arizona University
 80913815 80913814 - Last  Islamic  State  Hostage  Kayla  Mueller dead The family released this letter written while Ms Mueller was being held, parts of which have been redacted
Neither the White House nor her family have given the circumstances behind her death.
But White House spokesman Josh Earnest said regardless of the cause, ultimately it was IS who was responsible for her death because they were the ones holding her.
"That means they are responsible for her safety and her well-being. And they are therefore responsible for her death," he said.
 80921601 025812006 1 - Last  Islamic  State  Hostage  Kayla  Mueller dead Her family have said they are "heartbroken" by their loss
Three other US citizens - journalists James Foley and Steven Sotloff, and aid worker Peter Kassig - were beheaded by IS.
Mr Earnest said at least one other US citizen was being held hostage in the Middle East, without elaborating.
The militants' claims that Ms Mueller was killed by a Jordanian air strike were dismissed by Jordan as propaganda.
Washington has also cast doubt on the claims, with Mr Earnest saying there was "no evidence of civilians in the target area prior to the coalition strike taking place".
Ms Mueller worked with a number of humanitarian organisations at home and abroad.
She travelled to the Turkey-Syria border in 2012 to work with refugees.
 75306515 line976 - Last  Islamic  State  Hostage  Kayla  Mueller dead