DENVER The Colorado Bureau of Investigation issued an endangered missing alert for a 10-year-old Federal Heights girl on Wednesday.Liberty was last seen Monday evening in the 1400 block of W. 85th Avenue in Federal Heights.She is a 407 tall, 77-pound white female with brown hair and eyes.CBI said Liberty may be with her non-custodial mother, 29-year-old Alexandria Martinez, who may be in the Civic Center Park area of Denver.Martinez is described as a 504 tall, 185-pound white female with brown hair and brown eyes.If seen, call 911 or the Federal Heights Police Department at 303-428-8833.