Seth Altman, 33, who was last seen in Memphis, Texas, around 80 miles south of Amarillo. He is sought in connection with the injury of a law enforcement officer.

Recipients of the blue alert were warned to look out for 6-foot-2 Seth Altman, but told not to approach him and instead call the authorities. The system is designed to warn residents of potential public safety issues, including the more common AMBER Alerts or Silver Alerts for missing people.

Cellphones across Texas lit up early Friday morning with a blue alert. Find out here what the notice was about.

Blue alerts are one of several public safety alerts issued by the state when authorities need help finding someone.

Texans’ cellphones lit up around 4:50 a.m. with an emergency notification as authorities search for a man accused of shooting a police chief.

Seth Altman— "wanted for involvement in the killing or serious injury of a law enforcement officer"— was last seen in an area southeast of Amarillo. That's hours away from major Texas cities and their residents that were hit with an unexpected and loud early morning alert.

Residents in North Texas and across the state got an early start to their day Friday because of a blunder with the Blue Alert system.

Blue alerts are one of several public safety alerts issued by the state when authorities need help finding someone.

Hall County, 4 and a half hours northwest of Dallas. We’re told a deputy there was injured by a 33-year-old white man, 6-foot-2, 220-pounds.