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.

A South Texas resident was arrested Monday after authorities say the 21-year-old threatened local police and was plotting an attack reminiscent of the deadly 2016 Dallas police ambush, officials said.

Houston FBI officials announced Monday they partnered with the Corpus Christi Police Department to stop an alleged attack on police. Federal and local authorities said 21-year-old Seth "Andrea" Gregori was arrested Monday on a warrant for terroristic threat.