SEATTLE—Police arrested 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.

Auburn police spokesperson Commander Steve Stocker 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.

The Auburn Police Department said in a statement that the alleged incident reportedly occurred in the parking lot of a local Walmart after Nelly performed with the popular country group Florida Georgia Line at the White River Amphitheater, outside of Seattle.

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

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.

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

At 12:23 a.m. Saturday, after the Friday night show, Nelly 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 “My Place” and “Over and Over.” He appeared in the 2005 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 NBA’s Charlotte Hornets.

Since June, Nelly has performed as an opener on Florida Georgia Line’s “Smooth” tour, which was scheduled to continue Saturday night. Rosenblum said that as of Saturday afternoon, the rapper was still scheduled to perform and that no changes had been made to the tour.

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Representatives for Florida Georgia Line did not immediately respond to a request for comment.

With files from the New York Times