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.

The Blue Alert blared through cell phones and rattled devices, startling Texans with an unplanned awakening at 5 a.m.

Texas residents were awakened by an early morning phone alert Friday after the Texas Department of Public Safety issued a Blue Alert for a man wanted by police for an incident involving a law enforcement officer.

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.

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