Blue Alerts are issued to help catch people who are believed to have wounded or killed local, state or federal law enforcement officers. Here are the criteria for a Blue Alert: A law enforcement officer must have been killed or seriously injured by an offender.

Have you seen Benjamin Song? State and federal agencies have issued a Blue Alert for a suspect who allegedly shot a Texas police officer during the attack of a U.S. Immigration and Customs Enforcement (ICE) detention facility on July 4.

Oklahoma Highway Patrol issues Blue Alert in connection with July 4 ambush in Texas. Benjamin Hanil Song, considered armed and dangerous, on Texas' 10 Most Wanted.

Authorities have issued a Blue Alert for Benjamin Hanil Song, wanted in a North Texas ICE facility ambush on July 4 that wounded an officer.

The FBI said Song allegedly was involved at an attack on an officer on July 4 at Prairieland Detention Center in Alvarado, Texas.

Benjamin Hanil Song, a former Marine reservist, is wanted in connection with the coordinated July 4 attack, according to authorities.

The suspect, a former U.S. Marine Corps reservist, is accused of joining 11 others in an organized attack against officers at the Prairieland Detention Center.

Benjamin Hanil Song is accused of shooting an Alvarado police officer during an attack on the Prairieland Detention Center.

Texas is one of several states that use Blue Alerts, but what is it, and how does it differ from AMBER Alerts?

A Blue Alert was issued on Wednesday for a man accused of shooting an Alvarado police officer during an attack at a U.S. Immigration and Customs Enforcement detention facility on July 4, according to the Texas Department of Public Safety and the FBI.

A Texas firefighter pleaded for an alert amid rising flood waters. It took an hour to go out - Leaked audio provides new alert timeline as officials face scrutiny over when residents first learned of