where 14-year-old valentina peralta was there. she was hiding with her mother, hugging her mother and praying according to her family. the lapd did not recover a gun from this attacker. kyung lah, cnn, los angeles. >> cheryl dorsey is a retired lapd sergeant and is the author of the new book "the confidence chronicles: the greatest crime story never told." she joins me now from los angeles. sergeant dorsey, can you walk us through what you see in this video and specifically what does your training tell you about what happened here? >> well, we have to first acknowledge that the officers were responding to a code 3 radio call, which is the highest priority call that we respond to. that means red lights and siren. en route to this call, they're being told now that there are shots fired somewhere within this department store.