Mass shootings

There is already a "Parkland effect"

Jammal Lemy and Emma Gonzales in Chicago on June 15, the start of the summer campaign. Photo: Jim Young/AFP/Getty

The surprising endurance of the U.S. student anti-gun violence movement is usually traced to the February murder of 17 teens and teachers in Parkland, FL., and the rage of a tight group of hard-edged, culture-wise classmates there.

The long-term future impact of their campaign, if any — such as whether there will be a broader "Parkland generation" with an important legacy — can't yet be known. But there already are signs of a Parkland effect.

Authorities release final investigation report on Vegas shooting

A Las Vegas police officer speaks at a vigil for the victims of the Las Vegas shooting.
A vigil for an off-duty police officer that was killed during the Vegas shooting. Photo: Ethan Miller/Getty Images

Authorities are still without a motive to explain the deadliest mass shooting in modern U.S. history in Las Vegas last year, the Associated Press reports.

The big picture: Upon the release of the investigation's final report, Clark County Sheriff Joe Lombardo said they haven't found a motive for Stephen Paddock's October rampage that left 58 dead and hundreds wounded.