An image from a Connecticut State Police report on the shootings at Sandy Hook Elementary School shows a scene at 36 Yogananda St. in Newtown, Conn., where Adam Lanza killed his mother before driving to the school and killing 26 students and staff last December.
Officers on Capitol Hill look at a car following Thursday's shooting, which left Miriam Carey, 34, dead. "We're still very confused as a family why she's not still alive," Carey's sister says.
Kathy Gaarde, one of the people killed in Monday's shootings at Washington's Navy Yard, in a family photo. Her husband, Douglass, says the picture depicts Gaarde "with her 94-year-old mother who she cared for until she passed away last year."
President Obama walks out to deliver remarks on the economy at the White House on Monday. At the beginning of his news conference, Obama commented on the shootings at the Navy Yard.
Pablo Martinez Monsivais/AP
Homicide remains a leading cause of death for young people, even as rates drop. In Chicago, a teenage boy grieves next to a memorial where Ashley Hardmon, 19, was shot and killed on July 2. Gunmen fired while she was chatting with friends.
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A young neighbor watches as police respond to a double homicide in Flint, Mich., on June 30. Organizations including the Michigan Youth Violence Prevention Center are working to help young people choose non-violent solutions to conflict.
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Student Kahlil Quato fights tears as he speaks at a University of Chicago candlelight vigil in 2007. The service was held in remembrance of Amadou Cisse, a graduate student, who was shot to death at point-blank range.