McKayla Maroney alleges past abuses by Larry Nassar as early as 13

McKayla Maroney, who helped the "Fierce Five" U.S. women's gymnastics team to the gold medal at the 2012 Games, has alleged that she was abused as early as age 13 by Dr. Larry Nassar, who already is facing 22 counts of first-degree criminal sexual conduct and could receive life in prison.

Maroney, now 21, spoke out early Wednesday morning on Twitter, saying "silence has given the wrong people power for too long, and it's time to take our power back."

Maroney alleged that, starting when she was just 13, she had been "molested" by Nassar, who had been involved with USA Gymnastics for nearly three decades as a trainer and national medical coordinator, a role that led him to treat the country's elite gymnasts at four separate Olympic Games.

"Dr. Nassar told me that I was receiving 'medically necessary treatment that he had been performing on patients for over 30 years.' It started when I was 13 years old, at one of my first National Team training camps, in Texas, and it didn't end until I left the sport. It seemed whenever and wherever this man could find the chance, I was 'treated.'

"It happened in London before my team and I won the gold medal, and it happened before I won my silver."

Maroney also alleges that, when she was 15, Nassar gave her a sleeping pill during an all-day flight to Tokyo and that she woke up alone with him in his hotel room.

"For me, the scariest night of my life happened when I was 15 years old," Maroney wrote in her Twitter post. "... He'd given me a sleeping pill for the flight, and the next thing I know, I was all alone with him in his hotel room getting a 'treatment.' I thought I was going to die that night."

Attorneys representing 125 women who are suing Nassar agreed in August to take the cases to mediation, a step that could ultimately result in a settlement.

The plaintiffs are also suing USA Gymnastics; Nassar's former employer, Michigan State University; and other defendants. Attorneys have said more women are expected to join the lawsuits.

It is not known if Maroney is part of those lawsuits.

Nassar has already pleaded guilty to federal child pornography charges and awaits a Nov. 27 sentencing in that case.

He also faces charges in state court in Michigan, largely related to women who say he digitally penetrated them during medical exams for his own sexual gratification. If convicted on any one of the 22 counts of first-degree criminal sexual conduct, Nassar could receive life in prison.

In the past, Nassar and his attorneys have defended the intra-vaginal and intra-rectal treatments as accepted medical procedures.

ESPN's John Barr contributed to this report.