Research from the Environmental Working Group’s Action Fund has determined that some popular children’s toys contain a chemical that previous research has linked to lung disease and lung cancers. The researchers tested 28 boxes of crayons and 21 crime-themed toys at the Scientific Analytical Institute in Greensboro, North Carolina. They found that four of the crayon brands and two of the crime-scene toys contained asbestos.

All of the asbestos-containing toys were manufactured in China. The products included the Disney Mickey Mouse Clubhouse and Nickelodeon Teenage Mutant Ninja Turtle brands of crayons, the EduScience Deluxe Forensics Lab Kit and the Inside Intelligence Secret Spy Kit. The latter two brands contained asbestos within the fingerprint powders.

According to the U.S. Centers for Disease Control and Prevention, asbestos from all sources is responsible for up to 15,000 U.S. deaths each year.