Gov. Sam Brownback has ordered flags in Kansas to be flown at half-staff from sun-up to sundown through Oct. 6 after a mass shooting Sunday night at the Route 91 Harvest Festival, a country music festival in Las Vegas.

Sixty-four-year-old Stephen Paddock, the shooter, is said to have killed at least 59 people on the Las Vegas Strip, and injured more than 500 people. Paddock shot from a hotel room on the 32rd floor of the Mandalay Bay Resort and Casino shortly after 10 p.m. Authorities say it is the deadliest mass shooting in U.S. history.

“This purposeful act of terror is an unspeakable demonstration of evil,” Gov. Brownback said. “Mary and I and the people of Kansas are shocked, horrified, and grieving for everyone who is affected. We send our love and prayers to those suffering, and we will continue to pray because the healing process is only beginning.”