A blue alert is a public safety alert system used in the United States to broadcast information about suspects when an officer from a law enforcement agency has been killed or seriously injured in the line of duty. Blue alerts are designed to help in the apprehension of violent criminals who pose a significant threat to the public and other law enforcement personnel. They provide vital information such as descriptions of the suspect, the vehicle used in the commission of the crime, and other critical details that can assist in quick capture.