Since 2015, The Post has created a database cataloging every fatal shooting nationwide by a police officer in the line of duty.
The first days after a murder are crucial. For cases that remained open after one year, only 5 percent led to an arrest.
Homicide rates have soared in Baltimore, but the number of arrests have plummeted. Police and community leaders say the issue has roots in police mistrust and overwhelming caseloads.
A groundbreaking Washington Post analysis found that lockdowns have become a staple of American education -- and traumatize many students
Since the Parkland shooting, the business of staying safe in American schools is growing
A program targets young men with cash incentives to end gang-related violence.
For many police departments, new homicides are coming in faster than detectives can solve them.
After a deadly Kentucky school shooting, should the parent who failed to lock up his weapon be charged?
No arrests were made in the homicides of more than 18,600 black men and women.
The Post has mapped more than 52,000 homicides in major American cities over the past decade and found that across the country, there are areas where murder is common, but arrests are rare.