The effects of Sunday's mass shooting in Las Vegas that left at least 58 dead and 515 injured—one of the deadliest in American history—could be felt thousands of miles away in Washington, DC, where business was anything but usual Monday morning.

Flags at the White House and the Capitol Building were lowered to half-staff. Press conferences were canceled. Nevada representatives rushed aboard planes to get back to their home state.The president declared the shooting an "act of evil" and announced he will visit Las Vegas in person on Wednesday. Dozens of politicians turned to prayer, according to their press releases. But a debate over gun control legislation?

There, at least, things were business as usual.Authorities have since confirmed the shooter, 64-year-old Stephen Craig Paddock, opened fire on an outdoor country music festival crowd of more than 22,000 people from the window of his 32nd-floor hotel room, where police found 10 guns and Paddock's dead body. The type of guns and how Paddock purchased them were not yet known as of Monday afternoon.

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