A gunman who opened fire just outside a casino in Reno, Nevada, shot multiple people Monday morning before being taken into custody, police said. "Early this morning about 7:25, we received a report of an active shooter in the valet area at the GSR," Kathryn Nance, Reno Police Chief, told reporters. Reno police on Monday warned residents to stay out of the area. Multiple emergency vehicles, including several ambulances, responded outside the casino. The Grand Sierra claims to have the biggest casino floor in northern Nevada and sits just a few blocks from the Reno-Tahoe International Airport. It’s also one of the tallest buildings in the city, with nearly 2,000 hotel rooms. Last fall, President Donald Trump held a campaign rally in the resort's main ballroom.