DETROIT -- A newspaper reports that at least 40 girls and women say they were molested by a Michigan sports doctor over a 14-month period during which the FBI was aware that Larry Nassar had been accused of molesting elite gymnasts.

The New York Times says the FBI became aware of Nassar in July 2015. But he wasn't publicly exposed until The Indianapolis Star published allegations by a victim in 2016.

Federal authorities in Michigan subsequently charged Nassar with child pornography crimes. Sexual assault charges were later filed by the Michigan attorney general.

Nassar has been sentenced to decades in prison and will get sentenced in another case Monday.

The Times says the FBI declined to answer detailed questions about its Nassar investigation. The FBI said allegations against Nassar "transcended jurisdictions."