mass shootings

Long Beach Police Department via AP

LOS ANGELES — It had all the makings of a massacre. Six guns, including a Colt AR-15 rifle. About 1,000 rounds of ammunition. A bulletproof vest. And an angry Southern California man who threated to kill his co-workers at a hotel and its guests.

Craig Ruttle/AP

Most mass shooters in the U.S. acquired the weapons they used legally because there was nothing in their backgrounds to disqualify them, according to James Alan Fox, a criminologist with Northeastern University who has studied mass shootings for decades.

Evan Vucci/AP

WASHINGTON — President Donald Trump linked the suspected gunman in the Dayton mass shooting to liberal candidates and organizations Wednesday, even as he pushed back against critics who tied the El Paso attack to his own comments on immigration.