Syracuse University's basketball program has been the subject of a wide-ranging NCAA investigation, according to multiple reports.

Syracuse has received a letter of preliminary inquiry from the NCAA, which has been investigating the school for a multiyear period, CBSSports.com reported Wednesday, one day before the Orange begin play in the NCAA tournament against Montana.

It is unclear when Syracuse received the letter of inquiry. The nature of the alleged violations also is unknown, but CBSSports.com reported the transgressions are "major."

The scope of the investigation has expanded beyond the NCAA's inquiry last year into possible drug-related violations, and now includes the school's handling of Fab Melo's academic eligibility and an alleged sexual assault case involving three players in 2007, according to the Syracuse Post-Standard.

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