Two teachers are being questioned and three classes have been canceled at California State University's Northridge campus after students reported being offered top grades for selling raffle tickets, officials said.

Students reported that the three independent studies courses in African history and culture also required no classroom attendance and assigned no course work, said campus spokeswoman Ann Salisbury.University Vice President of Academic Affairs Bob Suzuki announced Thursday that the classes had been canceled and the school's campus police had launched an investigation.

The university is also considering disciplinary action against two teachers and may turn over the findings of its investigation to the district attorney's office, Salisbury said.