landed. that s the forensic work. and already 2,000 interviews or so conducted in this trying to gather all the information they can. the sheriffs department released a tick-tock ab, a time line of how the shooter came to the school, 2:19 he arrived in an uber. went inside the school with the black case. that had the gun inside. removed the gun and at 2:21, two minutes after arriving he began shooting in classrooms. there is a couple of interesting things that took place during that time line. the sheriff actually says he shot up two different classroom went to a third, and then came back and shot some more in the first two classrooms. he drops the gun eventually runs out blends with students. goes to a wal-mart, buys a drink and a sand wi67 only apprehended an hour later, don. drew, thank you very much for your reporting. i want to bring in cnn senior