Local and federal authorities are saying they thwarted a mass casualty attack Monday morning with the arrest of a 21-year-old Texas man accused of making terrorist threats against police officers.

The motive for the Scarborough shooting has yet to be determined, but investigators have said that one man was armed with an assault rifle.

A 17-year-old from Hockley was indicted on a terrorism charge — the first of its kind in the county, based on a recent state ...

The arrests came after three masked gunmen opened fire on a crowd at the grand opening of the Piper Arms pub on Progress Avenue Friday night.

Florida police have arrested a high school student after video emerged of a potential gunman threatening to open fire at a ...

Toronto Police charged two men who were allegedly plotting to carry out a murder plot at a bar in the GTA, a day after Scarborough shooting.

A Florida teenager was arrested Sunday after a video emerged of him apparently threatening to carry out a mass shooting on ...

Mooresville Police Chief Kerry Buckner said, "The pictures in her room they look like family photographs like you would put of your kids but they were all people who had committed mass shootings.

Cops in Indiana say they thwarted a Valentine’s Day mass shooting that a ... Trinity Shockley, 18, was arrested this week within days of police uncovering a plot to shoot up Mooresville High ...

The FBI stopped an alleged mass shooting plot at an Indiana high school. Officials said the teen's plan was exposed by a tip. Police say they foiled a potential Valentine's Day shooting at a high ...

He is charged with Intimidation Written/Electronic Threat of Mass Shooting ... as saying. The arrest marks the third time in recent weeks that an alleged school shooting plot has been thwarted.

MOORESVILLE, Ind. (WRTV/CNN/CNN Newsource/WKRC) - An Indiana high school student was arrested for an alleged Valentine's Day school shooting plot. An 18-year-old student in Indiana has been ...