Police say that the suspicious device that led to the evacuation on a Capitol Hill building was a homemade alarm system.

Denver police first received the call of the box around 3:16 p.m. at the apartment building at 930 Downing St., said Raquel Lopez, police spokeswoman.

Crews had been in the process of moving tenants from the apartment building, which was damaged by a fire early on May 6.

In one unit, the moving crews found many cameras and microphones, as well as the object they perceived to be a possible bomb.

“It was a metal box with wires connected to a bowl and wires that ran up the wall,” said Quientin McCarty, a mover who saw the device. “It was really intricate.”

The bomb unit decalred the situation safe before 5 p.m.

Three residents were treated for smoke inhalation during the May 6 fire.

Ryan Parker: 303-954-2409, rparker@denverpost.com or twitter.com/ryanparkerdp