This year's Boston Marathon was supposed to be free of so-called bandits - runners without official bib numbers - but a North Carolina woman says at least four people ran using her number.
Kara Bonneau says when she went online to get an official picture of herself, she found pictures of four strangers running with her number.
She tells WBZ-AM she thinks people made copies of her bib after she posted a picture on a social media website.
She says using counterfeit bibs is unfair to those who went through proper qualifying channels, and also poses a security issue.
A spokesman for the Boston Athletic Association, which organizes the race, says runners with counterfeit bibs still had to go through the same security checkpoints to get on the course.