Union troops hunted down John Wilkes Booth, the Confederate sympathizer who shot President Abe Lincoln, before finding him in a Virginia barn and killing him on this day in history, April 26, 1865.
There are reports of Russian exiles being targeted all over the world, from countries known to have a large Russian population to those once thought safe like Spain and the U.K.
Two of the three suspects in the June killing of Canadian Sikh separatist leader Singh Nijjar briefly appeared in court for the first time Tuesday morning.
Slovakia's PM Robert Fico was gravely wounded in an apparent assassination attempt weeks before an election; here's a look at other political assassinations and attempts this century.