Prosecutors for 44 U.S. states outlined Saturday why they filed a lawsuit accusing 20 drug firms of conspiring to inflate prices.

The prosecutors alleged after filing the suit in the U.S. District Court in Connecticut Friday that Teva Pharmaceuticals USA orchestrated the scheme with 19 other drug firms to stifle competition for generic drugs and increase prices sometimes by more than 1,000%.

Teva Pharmaceutical Industries Ltd denied the claims to Reuters and said it would fight the lawsuit.

Connecticut Attorney General William Tong told AP the states “have hard evidence that shows the generic drug industry perpetrated a multibillion-dollar fraud on the American people.”

“We have emails, text messages, telephone records and former company insiders that we believe will prove a multi-year conspiracy to fix prices and divide market share for huge numbers of generic drugs.”

Read more at AXIOS.