A teen with developmental disabilities was reported missing in Loveland on Monday, according to an endangered missing alert from the Johnstown Police Department. Tristan Bridges-Taapken, 15, was last seen Sunday around 6:30 p.m. at the Target on Rocky Mountain Avenue in Loveland, police say. He is described as a 5-foot, 10-inch, 150-pound white boy with brown hair and brown eyes.