Spurs guard Manu Ginobili said there was a lot of smoke in their locker room.
Standing outside the Timberwolves' bus in shorts and practice shirt, guard Ricky Rubio had no idea what happened.
"They just told us to leave," Rubio said in Spanish.
Both teams were scheduled to travel home right after the game. The Spurs next host the Indiana Pacers on Saturday night.
The Timberwolves, who play the Miami Heat on Saturday night, were coming off a stretch in which they played a franchise-record 18 games before Dec. 1. The postponement gives them a much-needed break.
Coach Rick Adelman was unhappy that his team had to give up a home game in Minnesota. Now, the Timberwolves will likely make up the game after the return of key bench players Chase Budinger (knee) and Ronny Turiaf (elbow).
Adrian Perez, marketing manager for the arena, said fans will be reimbursed.