11 officers responded to Uvalde shooting within 3 minutes, source says, as new reports reveal how authorities then waited to engage

Eleven officers -- including Uvalde school district police chief Pete Arredondo -- were inside Robb Elementary within three minutes of a gunman entering on May 24, a law enforcement source close to the investigation tells CNN, as new reports provide a closer look at what officers were doing as they waited more than an hour to confront the shooter.