The UFC fight on Saturday between Darrick Minner and Shayilan Nuerdanbieke, which ended abruptly in the first round, is being investigated by a U.S.-based betting integrity firm after several sportsbooks in multiple states reported suspicious wagering on the featherweight bout.

The odds on Nuerdanbieke defeating underdog Minner moved dramatically in the hours leading up to their UFC Fight Night matchup in Las Vegas. Bettors were convinced that not only would Nuerdanbieke win, but he would do so in the first round. Money poured in on the favorite to win by knockout in the first round and for the fight to last fewer than 2.5 rounds, prompting some sportsbooks to take the fight off the board, according to an analysis conducted by U.S. Integrity, a Las Vegas-based firm that works with sportsbooks and state gaming regulators to monitor the betting market, a copy of which was obtained by ESPN.