New York City police detectives searched a studio apartment in Las Vegas that belonged to the suspected gunman in Monday's mass shooting at a Midtown Manhattan.

When I look into you and dad’s eyes, all I see is disappointment,” Tamura wrote to his mother in the note. “I love you, Momma. I’m sorry.”

Detectives searched the studio apartment of 27-year-old Shane Tamura, who shot five people on Monday before killing himself, in Las Vegas and found 100 9mm rounds, a tripod for the rifle used in the shooting, and an empty hand box for a revolver, police said Wednesday, according to The Hill.