Believed to be first time Islamic State claimed to carry out operation in U.S.
Mayor said she believed sufficient calm had returned after days of riots.
Marches against racial profiling held in several cities after unrest in Baltimore.
The city was shaken by the worst rioting in the United States in years.
A study looked at alcohol consumption trends in U.S. counties.
Two al Qaeda hostages were killed in a U.S. drone strike.
Jury will now decide whether Dzhokhar Tsarnaev will be executed.
Video showed officer shoot apparently unarmed black man 8 times.
The state department said the group was responsible for systematic human rights abuses, including mass executions, rape and the killing of children. It also offers up to $10m for I.S. leader Abu Bakr al-Baghdadi.
Group's decision to honor the French satirical weekly drew heavy criticism.
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