The group has cut off an entire town from food, water and medicine, the U.N. says.
Americans remain in Islamic State custody as U.S. considers striking ISIS strongholds in Syria.
Ann Summers, a retailer of lingerie and other adult products, apologized for timing of its Isis line.
The cleric said Islamist militants are recruiting Canadians and have issued death threats against him.
Following the killing of U.S. journalist James Foley, Muslims from around the world voiced their outrage on social media.
A year after the deadly chemical attack in Syria, some stockpiles may still be undeclared, leaving them vulnerable to ISIS in the future.
Calling ISIS "an imminent threat" to U.S. interests, officials outlined the steps needed to vanquish the Islamic militant group.
Didier François, who spent months in captivity in Syria with James Foley, said they were often mock-executed by their ISIS captors.
It's unclear how James Foley's family and GlobalPost responded to the ransom demand, but the U.S. refused to pay.
Malaysian authorities suspect that nearly 20 Malaysians and 500 Indonesians have gone to fight with the Islamic State in Syria.
Indonesia's president said he was shocked after watching a video of the beheading of an American journalist by the Islamic State.
The ISIS militants who beheaded James Foley apparently had been given the journalist as a token of allegiance by another group.
"Jim was taken from us in an action of violence that shocks the conscience of the entire world," President Obama said of James Foley's beheading.
The video ends with ISIS threatening to kill another man — believed to be U.S. journalist Steven Joel Sotloff.
ISIS victim Foley was a photojournalist who made his home in New Hampshire.
Freelance journalist James Foley, who disappeared in Syria in November 2012, was allegedly beheaded in a graphic video by ISIS militants.
President Obama said Monday that the "work is not yet done" in Iraq.
Pope Francis Monday endorsed the use of U.S. airstrikes to combat Islamic State militants.
The Sunni militant group targeted the Shueitat tribe because it launched an uprising against ISIS rule in eastern Syria.
The name Haruna Yukawa matches that of the self-proclaimed CEO of a Tokyo-based private security firm.
Thousands of Twitter users turned to humor to vent their frustrations about the Islamic State.
The Sunni insurgents made striking advances in Syria, seizing three villages near Aleppo, while slaying 700 members of the same tribe.