Driver ‘Huffing’ Before Killing Girl Scouts in Wisconsin Hit-and-Run

This photo provided by the Chippewa County Sheriff's Office in Wisconsin shows Colten Treu, who is accused of striking and killing three Girl Scouts and a parent and critically injuring a fourth girl who were picking up trash along a rural roadway near Chippewa Falls, Wis., on Nov. 3, 2018. (Chippewa County (Wis.) Sheriff's Office via AP)

A 21-year-old driver was inhaling chemical vapors, or “huffing,” just before he is suspected of striking and killing three Girl Scouts and a woman as they picked up roadside litter on Nov. 3 in a hit-and-run crash, police said on Nov. 5.

Another girl was critically injured in the collision near Lake Hallie, around 90 miles east of Minneapolis. The woman killed was the mother of one of the girls killed, Lake Hallie Police Department said in a statement.