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Caption:PHILADELPHIA, PA - MAY 13: A man walks past a police truck with its flickering blue lights near the wreckage of an Amtrak passenger train that derailed carrying more than 200 passengers from Washington, DC to New York on May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Mark Makela/Getty Images)
Caption:PHILADELPHIA, PA - MAY 13: A man walks past a police truck with its flickering blue lights near the wreckage of an Amtrak passenger train that derailed carrying more than 200 passengers from Washington, DC to New York on May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Mark Makela/Getty Images)

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    Ohio police officer slain in shooting

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Ohio police officer slain in shooting

An Ohio police officer was killed in a shooting while responding to a domestic incident, authorities said.

Ohio police officer slain in shooting

An Ohio police officer was killed in a shooting while responding to a domestic incident, authorities said.