US police assess potential threat rise after 3 mass shootings

In the weeks since three high-profile shootings in three states took the lives of more than two dozen people in one week in August, law enforcement authorities nationwide reported a spike in tips from concerned relatives, friends and co-workers about people who appear bent on carrying out the next mass shooting.

Mass shooters exploited gaps, errors in US background checks

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

McConnell says he's waiting on Trump to chart path on gun legislation

Congressional Republicans are waiting for the White House to chart a path forward on gun violence legislation, Senate Majority Leader Mitch McConnell said Tuesday, effectively putting the burden on President Donald Trump to decide the GOP's legislative response to the spate of mass shootings that included another deadly attack in Texas over the weekend.