The fallout from the Los Angeles Lakers' overtime loss to the Boston Celtics on Saturday continued Sunday with a statement from the National Basketball Referees Association on its official Twitter account.

"Like everyone else, referees make mistakes," the union wrote in its tweet. "We made one at the end of last night's game and that is gut-wrenching for us. This play will weigh heavily and cause sleepless nights as we strive to be the best referees we can be."

After L.A.'s 125-121 OT loss to the Celtics, the crew chief for the game, Eric Lewis, said the referees should have called Jayson Tatum for a shooting foul on LeBron James' last-second layup attempt. James would have gone to the line with a chance to win the game with the score tied 105-105.