On October 1, 2017, a concert in Las Vegas became the scene of one of the deadliest mass shootings in modern American history. In this clip, we discuss the disturbing preparation behind the Mandalay Bay attack, including how the shooter brought weapons and ammunition into his hotel suite and took steps to monitor the hallway before opening fire on the crowd below. How does someone plan an attack of this scale over multiple days without being detected? We break down the planning, the warning signs, and the questions that still surround this horrific case. #MandalayBay #LasVegasShooting #TheBrighterSideOfBlue