A new wave of anger swept through Uvalde on Tuesday over surveillance footage of police officers in body armor milling in the hallway of Robb Elementary School while a gunman carried out a massacre inside a fourth-grade classroom where 19 children and two teachers were killed. The video published Tuesday by the Austin American-Statesman is a disturbing 80-minute recording of what has been known for weeks now about one of the deadliest school shootings in U.S. history: that heavily armed police officers, some armed with rifles and bulletproof shields, massed in the hallway and waited more than an hour before going inside and stopping the May 24 slayings. But the footage, which until now had not surfaced publicly, anguished Uvalde residents anew and redoubled calls in the small South Texas city for accountability and explanations. The footage from a hallway camera inside the school shows the gunman entering the building with an AR-15 style rifle and includes 911 tape of a teacher screaming, "Get down! Get in your rooms! Get in your rooms!" Two officers approach the classrooms minutes after the gunman enters, then run back amid the sounds of gunfire. As the gunman first approaches the classrooms a child whose image is blurred can be seen poking their head around a corner down the hallway and then running back while shots ring out.