The apparent killing of 47-year-old Kenji Goto - the second beheading of a Japanese hostage in a week - was announced in a video released online that included no mention of a Jordanian pilot also being held by IS, whom the militant group has threatened to kill.
The visa waiver programme, which covers tourists from 38 countries, represents the "Achilles' heel of America," said Senator Dianne Feinstein, who is urging a tightening of the rules.
Kurdish fighters' success in recapturing the key Syrian town of Kobane from Islamic State extremists was a "big deal," US Secretary of State John Kerry said.
A visibly upset Japanese Prime Minister Shinzo Abe vowed to "never forgive terrorists" after the Islamic State group released a video purportedly showing the beheading of hostage Kenji Goto.
A fire that ripped through one of Russia's largest university libraries is believed to have damaged over one million historic documents.
Japan on Sunday (Feb 1) said it was "outraged" after the Islamic State (IS) group released a video purportedly showing the beheading of Japanese hostage Kenji Goto.
The Islamic State group said in a video it had beheaded a second Japanese hostage, drawing outrage from Tokyo and condemnation from Washington.
Peace talks to thrash out a truce agreement between pro-Russian rebels and Ukraine ended without a deal on Saturday (Jan 31), Kiev's representative at the talks in Minsk said.
Turkey is under pressure to do more to thwart the transit of extremists across its territory to war-torn Syria.
Egyptian President Abdel Fattah al-Sisi said the battle against extremist insurgents in the Sinai Peninsula would be a long and hard one, as violence there continues unabated.