Active Shooter

Metro officials said they had recently beefed up security measures, including increased police patrols and video surveillance

The suspect reportedly told police he carried out the attack after a supervisor demanded he pay $100 to fix a forklift damaged at work

Authorities say Huu Can Tran hadn’t been to the dance hall in at least five years and did not appear to target the victims specifically

The public wasn’t notified of the shooting for five hours, but Chief Scott Wiese said he didn't have enough information to effectively alert residents

The 72-page report analyzed 173 incidents that resulted in three or more individuals injured or killed across public or semi-public spaces

The massacre is believed to be a "workplace violence incident," officials said

The gunman had visited Hemet police twice this month to report he was the victim of fraud, theft and poisoning by family members

Four people were killed at a mushroom farm and three at a trucking business on the outskirts of Half Moon Bay

Three officers were nearby when shots were fired and their "immediate response prevented further injuries," police said

“I needed to take this weapon, disarm him or else everybody would have died," a man whose family runs the venue said

Police have yet to reveal a possible motive for the shooting, including whether it was a possible hate crime or domestic violence incident

Evansville Police Chief Billy Bolin said the shooter, a former employee who wounded one victim, "absolutely planned to die last night"

Strategies for success in 23 key areas of policing

Some LE cars were left locked and couldn't quickly be moved, forcing medics to try various routes to the school, crisscrossing through residents' yards

Evidence shows the teen fired at officers first after shooting six people, fatally wounding five; the suspect later died due to a self-inflicted gunshot wound