A fourth night of chaos in Los Angeles as protesters angry about federal immigration raids clashed with the LAPD and national guard... with marines also deployed to help restore peace. A news crew captured two women handing out full face masks to the demonstrators. The masks are called "bionic shields" because they offer full protection from the tear gas and rubber bullets being fired by law enforcement. And the reporters covering the mayhem live say it's like being in a warzone. They often find themselves in the line of fire...one even landed in the hospital after getting struck in the leg by a projectile. Plus, a doorbell camera captures a nanny in distress. While taking care of three children, she was attacked with bear spray by a home invader... and the home targeted wasn't just any home, it reportedly belongs to Grammy winning singer Macklemore. And it's the gas you get at the dentist to help you relax... it's called nitrous oxide, but you may know it as laughing gas. It can also be used to make whipped cream. Now comes a warning after a 29-year-old woman died after inhaling the gas for fun.