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SEATTLE — Police arrested the rapper Nelly early Saturday after a woman said he raped her on his tour bus in a town outside Seattle, an accusation the Grammy winner's attorney staunchly denied.

Cmdr. Steve Stocker, a spokesman for the police department in the town of Auburn, Washington, said Nelly, whose real name is Cornell Iral Haynes Jr., was in jail Saturday after being arrested at about 4:37 a.m. in his tour bus at a Walmart.

Police said in a statement the woman called 911 to report being sexually assaulted by Nelly on the tour bus.

Nelly performs on Day 8 of the RBC Bluesfest on July 16, 2016 in Ottawa, Canada. Mark Horton / Getty Images

He will have his first appearance before a judge "at some point," Stocker said. Nelly was scheduled to perform in Ridgefield, Washington, on Saturday night.

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His manager, Juliette Harris, did not immediately respond to an email asking about his scheduled performance.

Let me say that I am beyond shocked that I have been targeted with this false allegation. I am completely innocent. I am confident that once the facts are looked at , it will be very clear that I am the victim of a false allegation. — Nelly_Mo (@Nelly_Mo) October 7, 2017

I do want to apologize to my loved ones for the embarrassment and for putting myself in a situation where I could be victimized by this false and defaming allegation. — Nelly_Mo (@Nelly_Mo) October 7, 2017

I also want to thank my fans for their unwavering support. They know me. I assure you I will be vindicated. And I assure you, I will pursue every legal option to address this defaming claim. Thank you — Nelly_Mo (@Nelly_Mo) October 7, 2017

Nelly performed at the White River Amphitheater in Auburn on Friday night. He's on tour with the country band Florida Georgia Line.

Related: Fans #SaveNelly After IRS Makes It 'Hot in Herre' for Rapper

At 12:23 a.m. Saturday, after that show, he sent out a tweet that said in part: "its (sic) really you against the whole world because the whole world don't know you exist."

Nelly's attorney, Scott Rosenblum, called the rape claim a "completely fabricated allegation."

"Our initial investigation clearly establishes this allegation is devoid of credibility and is motivated by greed and vindictiveness. I am confident, once this scurrilous accusation is thoroughly investigated, there will be no charges. Nelly is prepared to address and pursue all legal avenues to redress any damage caused by this clearly false allegation," Rosenblum said in an email.

Nelly is a three-time Grammy winner, including for the song "Hot in Herre," which won the best male rap solo performance award in 2002.

The song has been sampled and re-recorded by other artists and is ranked No. 21 on a Rolling Stone magazine list of top summer songs. Nelly is also known for the hits "Air Force Ones," "Dilemma" and "Over and Over." He recently appeared in a recurring guest role on the BET comedy series "The Real Husbands of Hollywood" and in 2005 he starred in the film "The Longest Yard."

The following year he shared a Grammy for the song "Shake Ya Tailfeather" with Murphy Lee and Sean Combs.

Nelly is also a minority owner of the Charlotte Hornets.