President Barack Obama traveled to Dover Air Force Base in Delaware on Tuesday to honor the 30 U.S. troops who were killed in a helicopter crash in Afghanistan on Saturday.
A helicopter belonging to the NATO-led International Security Assistance Force (ISAF) crashed in eastern Afghanistan on early Saturday morning, the alliance said, but no casualties were reported.
Four senior police officials were killed on late Wednesday morning when a police helicopter crashed into houses in the central Nigerian city of Jos, officials said on Thursday.