Three or four Northwestern University football players are under investigation for point-shaving in a federal gambling probe at the prestigious Big Ten school that has already netted six others, a published report said Friday.

The players under investigation are believed to have wagered on two 1994 games in which they tried to affect the final score to win their bets on the point spread, according to the Chicago Sun-Times, which quoted unidentified sources.A spokesman for the U.S. Attorney's Office did not return a telephone call for comment on the Sun-Times reports.