The suspect, said to be known to police and intelligence, had wounded an officer during a routine check before arriving at the airport.
If confidence in vaccination falls, herd immunity will fall and epidemics will recur.
The FBI is offering a $20,000 reward for information that leads to the shooter.
Trooper Landon Weaver was killed serving a protection order on Jason Robison, authorities say.
Fethullah Gulen called Ambassador Karlov's killing a "heinous act of terror".
Around 18 Russian experts will assist the investigation into Ambassador Karlov's shooting.
Officers were responding to an apparent domestic dispute call when they came under fire.
An investigation into her death is currently frozen. The culture of impunity that exists is a threat to the freedom of the press.
Alleged shooter, 14, charged with murdering father, wounding two others.
International investigators reported on Wednesday that a Russian missile downed the jet.
The Ministry of Foreign Affairs said Moscow is the only credible source of information.
Investigators told the victims' families that the rocket was fired from rebel-held ground.
One person was on life support after being shot by a civilian late Wednesday as riot police used tear gas, rubber bullets and flash-bang grenades to try to disperse demonstrators.
The man wounded up to nine people in a knife attack at a mall in central Minnesota before he was shot dead by an off-duty police officer.
Jack Burkman says he wants to either confirm or debunk the conspiracy theories around the case.
Former deputy prime minister Boris Nemtsov was shot and killed in central Moscow in February 2015.
All five crew members are reported dead.
More than 260 people died during the attempted coup.
The Ukrainian government claims to have uncovered weapons used to kill over 100 pro-European protesters in 2014.
A soldier fired a single pistol shot when the escaped animal, despite being tranquilized, approached the soldier, the army said.