Macklin requested backup from the state police and then called the Oakland PD and asked for chopper surveillance.

Allen requested backup, but the two opted not to wait for the backup to arrive.

When it was clear nothing was working, at 8:06, Ogden requested backup from the pediatric specialist on call - Dr. Miller.

He calls in a possible kidnapping to the NYPD, requesting backup.

One car is on the scene, one on the way, and the officers are still requesting backup.

"After I did an initial survey I called in and requested backup and investigators, secured the area and waited for response."

Pioneer Commander is requesting backup.

Armes gave his position, the address of the sandwich shop, and requested backup.

Officer Walker arrives as the homicide detectives have requested backup.

Bess watched, wide-eyed, as Judd radioed in an armed robbery in progress, gave their location and requested backup.