The FBI’s Dallas office is seeking 32-year-old Benjamin Hanil Song, a former Marine Corps reservist, in connection to the ambush at the Prairieland Detention Center, according to a wanted poster for Song.

Phones buzzed across Texas just before 8 p.m. Wednesday with a high-priority emergency alert. But it wasn't about flooding, a storm, or a missing child. It was about a five-day-old shooting at an ICE detention center hundreds of miles away.

After a Blue Alert was sent to the entire state of Texas Wednesday evening for a suspect wanted in the Dallas area, many are wondering what the alerts mean and why residents hundreds of miles away receive them.