WESTMINSTER, Colo. (AP) -- A teenage boy who lived just a mile from a 10-year-old Colorado girl who was abducted and killed earlier this month has been arrested in her death and in a May attack on a 22-year-old woman.

Police in the Denver suburb of Westminster say a Tuesday phone call led them to the home of 17-year-old Austin Reed Sigg. Police took Sigg into custody Tuesday night and officially arrested him Wednesday.

Reached by phone, Sigg's mother told The Associated Press he turned himself in.

The Arapahoe Community College student lives about a mile from the home of Jessica Ridgeway, who disappeared Oct. 5 after leaving for school. Her remains were found five days later.

Police Chief Lee Birk called the arrest a "significant step towards justice for Jessica."

Sigg's first court appearance is set for 8 a.m. Thursday.