Group's progress alarming regional and Western powers.
Two men were convicted of raping, murdering 11-year-old girl.
Pro-Moscow rebels fighting in Ukraine said on Friday they would comply with a request from the Kremlin and open up a 'humanitarian corridor' to allow the withdrawal of Ukrainian troops they have encircled.
American man was believed to be fighting alongside Islamist militants.
Tensions have eased in Ferguson, Missouri, after days of unrest.
The attack, which Community Health Systems believed originated in China, happened in April and June this year.
Police in Ferguson, Missouri, claim to come under "heavy fire," arrest 31.
Dollar General Corp offered to buy Family Dollar Stores Inc for $8.95 billion, trumping a bid by Dollar Tree Inc.
The U.N. has declared its highest level of emergency in Iraq as a humanitarian crisis follows the rapid advance by Islamic State militants in the north.
During their call, the two leaders reportedly discussed the growing instability in Iraq and the crisis in Gaza.
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