New evidence shows Jeffrey Epstein sexually abused and trafficked hundreds of young women and girls on his private Caribbean island, some as recently as 2018, significantly expanding the scope of his alleged conduct, a top law enforcement official said in a lawsuit filed on Wednesday.

Mr. Epstein, a wealthy financier who died by suicide in a Manhattan jail last year, was bringing girls as young as 11 and 12 to his secluded estate in the Virgin Islands, known as Little Saint James, and kept a computerized database to track the availability and movements of women and girls, the lawsuit said.

The lawsuit, which was filed by Denise N. George, the attorney general of the Virgin Islands, broadened the dimensions of the wrongdoing in which Mr. Epstein was said to have engaged. He had been charged by Manhattan prosecutors in July with sexually exploiting dozens of women and girls in New York and Florida, but they did not point to any actions beyond 2005.

In August, Mr. Epstein hanged himself at the Metropolitan Correctional Center, where he was being held awaiting trial on federal sex trafficking and conspiracy charges. Prison guards had not checked on him for hours on the night he died, and the circumstances surrounding his death are now the subject of at least three federal investigations.