At least one killed, multiple wounded after shooting at Pennsylvania's Lincoln University

Three dead, nine injured in early morning shooting at New York nightclub

Nashville school shooter had 'emotional disorder'

Multiple people dead in Virginia Walmart shooting, including gunman

Ten people, including suspected assailant, killed in Dayton, Ohio shooting

Former officer charged for not responding to Florida school shooting

Disgruntled city employee kills 12 in Virginia; suspect also killed

Manhunt launched after shooting on Dutch tram kills one, wounds many

Multiple deaths reported in New Zealand shooting at two mosques