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The family of murdered journalist James Foley received an email from his captors last week which outlined their intention to execute him, GlobalPost's chief executive has confirmed.
Phil Balboni said the email was "full of rage against the United States for the bombing" of Islamic State targets.
"We communicated ... as quickly as we could with the captors and pleaded with them for mercy," he told reporters.
"[We] explained to them that Jim was an innocent journalist, had done no harm to the Syrian people ... Sadly they showed no mercy to Jim."
Foley was a freelance journalist working for the GlobalPost news site in Syria at the time of his capture in 2012.
The Israeli military has targetted a person who it claims was responsible for rocket barrages in the south of the country.
A short while, the IDF targeted a terrorist who was responsible for the rocket barrages at southern Israel earlier this evening.
They did not name the target or specify whether the mission was successful.
Airlines should stay away from Israel's Ben Gurion International Airport from Thursday, according to Hamas' military spokesperson.
Abu Ubaida also said the group would target Israeli public sites such as football stadiums and he cautioned Israelis living near to Gaza against returning to their homes.
Former US presidential candidate John McCain said the beheading of journalist James Foley should serve as a turning point for Barack Obama's deliberations on how to deal with Islamic State militants.
"I don't think there's any doubt that this horrible video on the internet is bound to have an impact on the American people," McCain told Reuters.
"The nature of the brutality of this organisation has been brought home by this."
The Republican senator called for a dramatic increase in air strikes against Islamic State targets in Iraq and suggested they should extend into Syria, saying, "We have to defeat them, not stop them."
A suspected Ebola patient has been admitted to a hospital in northern California, health officials have said.
Blood samples will now be tested by federal disease control experts.
If the patient tests positive, it would be the first confirmed case of Ebola in the United States, aside from two American relief workers who flew back for treatment after contracting the disease in Liberia.
Up to 300 extra US soldiers have been requested to provide security in Iraq, according to Reuters.
An unnamed US official told the agency that the request, by the State Department, had not yet been approved.
More than 800 American soldiers have already been sent to Iraq since Islamic State militants invaded the north of the country in June.
US Secretary of State John Kerry has paid tribute to murdered journalist James Foley, saying: "No masked coward can ever steal his legacy."
He also expressed his rage at the Islamic State, who were behind the attack, labelling them "ugly, savage, inexplicable, nihilistic, valueless evil."
Jim Foley went to the darkest of places to shine the light of truth/he was brave and bold/no masked coward can ever steal his legacy
His family is incredible/we’ve all been touched by their fight for Jim.
There is evil in this world. ISIL = ugly, savage, inexplicable, nihilistic, valueless evil.
Israel's prime minister has accused Hamas of using "savagery" against civilians like the Islamic State militants in Iraq.
At a news conference in Tel Aviv, Benjamin Netanyahu said there "will be a continued campaign" aimed at restoring "calm and safety" to Israeli citizens.
He added that he saw a "new diplomatic horizon" ahead for Israel in the region.
The US military has launched 14 air strikes on Islamic State fighters near Mosul Dam in Iraq, US Central Command has said.
The strikes "destroyed or damaged" six Islamic State vehicles, three improvised explosive devices, one mortar tube, and two armed trucks, a statement reads.
– US Central Command statement
These strikes were conducted under authority to support Iraqi security forces and Kurdish defence force operations, as well as to protect critical infrastructure, US personnel and facilities, and support humanitarian efforts.