Leaders of a House committee say they are alarmed over new findings outlining extensive Russian state-sponsored doping of Olympic athletes.

“The extraordinary lengths the Russians took to cheat in Sochi are cause for significant alarm and should serve as a warning for Rio,” said Reps. Fred Upton, R-Mich., and Frank Pallone, D-N.J., chairman and the top Democrat, respectively, on the House Energy and Commerce Committee.