The 47-year-old suspect wanted for killing three people at a Colorado Walmart has been arrested, police announced Thursday.

Scott Ostrem allegedly strolled into the Thorton store and began shooting at around 6:10 p.m., Thornton police spokesman Victor Avila said.

“He walked in very nonchalantly with his hands in the pockets, raised a weapon and began shooting. Then he turns around and walks out of the store,” Avila told the Denver Post. “From what we have right now it appears to be random. It’s a crazy world we live in.”

Two men and a woman were killed.

Ostrem was taken into custody around 8 a.m. local time, officials said.