PHOENIX -- Dozens of guests and employees at a northwest Phoenix hotel were evacuated Sunday night after a what appeared to be a smoke bomb of some sort went off.

Smoke filled 2 floors

Fire crews are still trying to figure out exactly what happened at the Hilton Garden Inn near Pinnacle Peak and 19th Avenue.

The device was set off inside a fourth-floor room. Inside that room, authorities found a variety of weapons, including guns and bullets.

Thick smoke filled two floors of the hotel, sparking the evacuation 35 rooms and a total of 60 guests and employees. Those affected guests were later relocated to other rooms.

While nobody was seriously injured, one man was treated for smoke inhalation.