of the window. >> reporter: these officers desperately attempting to locate the shooter, while taking cover under a hail of bullets. >> go back! go back! >> get back. get back. >> reporter: this new video captures the concertgoers running in every direction as they were being fired upon. police say the killer opened fire for 9 to 11 minutes, firing dozens of rounds in rapid succession. >> mandalay bay, 31st floor. i can hear the automatic weapon coming from one floor ahead, one floor above us. >> be advised, it is automatic fire. fully automatic fire from an elevated position. take cover. >> reporter: these pictures published by the daily mail providing a chilling look inside the killer's 32nd hotel suite and the arsenal used to carry