the kids. >> back up! >> reporter: moments later, in the video shot last thursday, you see the officer burying his knee into the boy's head. a second officer helps drag the teen into the street. you can hear the children shouting threats. >> wait, we're going to put a report on these two fools. >> reporter: one mother defending her son, saying the officer was choking him before the video started rolling. >> i see the officer choking my son, and i'm like, what are you doing? >> reporter: the city says the officer was responding to a trespassing call and will remain on desk duty while they investigate. david, so far police have not commented on what happened before the video started rolling, but they tell abc news they plan on interviewing everybody involved as part of the investigation. david? >> kayna, thank you. when we come back, a passing to report tonight from hollywood. also, more that midair scare on an american airlines flight out of chicago, forced to turn back. what we've learned. we've lve learned. . ...with fitness