President Donald Trump ordered US flags on federal buildings lowered to half-staff after the deadliest shooting in modern American history.

At least 59 people were killed and 527 were injured after 64-year-old Stephen Paddock opened fire on a music festival in Las Vegas Sunday night.

Trump will travel to Las Vegas on Wednesday to meet victims’ families, first responders, and local officials.

Here’s what Washington, DC looked like on Monday:

US Flag Half Staff Gabrielle Giffords United States Capitol Mark Kelly

Foto: With the flag flying at half staff for the victims of the Las Vegas shootings, former Rep. Gabrielle Giffords, D-Ariz., right, shakes her fist at the United States Capitol as she and her husband Mark Kelly, left, speak on Capitol Hill in Washington, Monday, Oct. 2, 2017, about the mass shooting in Las Vegas. source AP Photo/Susan Walsh

US Flag Half Staff Capitol

Foto: An American flag flies at half-staff at the U.S. Capitol, on October 2, 2017 in Washington, DC. source Mark Wilson/Getty Images

US Flag Half Staff White House

Foto: Tourists pose for photographs as the U.S. flag flies at half-staff over the White House October 2, 2017 in Washington, DC. source Chip Somodevilla/Getty Images

Las Vegas City Hall lowered its flags as well: