U.S. aid worker Kayla Mueller, held hostage by Islamic State militants for 18 months, is dead, her family said on Tuesday, but the circumstances were unclear and President Barack Obama vowed to hunt down the culprits.
Islamic State's execution of a captured Jordanian pilot by burning him alive has backfired on the militant group by galvanizing the U.S.-led coalition that is fighting it in Syria and Iraq, a senior U.S. official said on Sunday.
Russian-backed rebels' violent offensive in eastern Ukraine leaves President Barack Obama with perplexing and urgent choices, but aides say he will exercise his typical caution in deciding his next move.
Tunisia arrested 32 militant Islamists, some of them returning from fighting in Syria, who planned "spectacular" attacks, officials said on Saturday.
