CORPUS CHRISTI, Texas — Authorities in Texas said they thwarted a "mass casualty attack" after arresting a 21-year-old who allegedly made terroristic threats against local police officers.

Voislav Torden, a Russian citizen known as Yan Petrovsky, was found guilty on four of five charges related to the ambush, murder, and mutilation of Ukrainian soldiers and distributing denigrating ...

Gregori had allegedly "planned an attack on police similar to the 2016 Dallas ambush," the FBI's Houston field office said in a statement. In July 2016, 25-year-old Micah Xavier Johnson shot police ...