Investigators seize guns from suspected Oxford school shooter's home

"The next few days are going to be key to see what caused this individual to do this," said former FBI Special Agent Andy Arena. "Was this a random act, or was there a specific reason he went after these individuals - usually there is – usually in hindsight, they went after a (certain person)."

Nikolas Cruz to plead guilty to Parkland school massacre, attorney says

The gunman who killed 14 students and three staff members at a Parkland, Florida, high school will plead guilty to their murders, his attorneys said Friday. The guilty plea would set up a penalty phase where Nikolas Cruz would be be fighting against the death penalty and hoping for life without parole.

Borderline Bar & Grill: Report details likely motive for mass shooting

Ventura County sheriff’s detectives concluded in the 424-page report that Ian David Long, a Marine Corps veteran who served in Afghanistan, likely attacked the Borderline Bar & Grill, knowing of the college theme and that there would likely be many students present.

Body cam video shows moment officers respond to VTA mass shooting

Almost one week after a disgruntled Valley Transportation Authority employee carried out a deadly mass shooting at a rail yard where he worked, authorities released body-worn video of law enforcement officers' quick response to the active shooter scene.

Remembering the San Jose VTA shooting victims

The nine victims range in age from 29 to 63. They are all men. Through their careers with VTA, their job titles included bus and light rail operators, mechanics, linemen and an assistant superintendent. One had worked for the agency since 1999.