TUCSON, Ariz. — The NCAA is investigating Arizona's basketball program for alleged recruiting violations, according to a letter sent to university president Robert Shelton.

The Arizona Daily Star reported on its Web site that the allegations stem from initially self-reported violations involving an elite recruiting event at McKale Center known as the Cactus Classic.

The letter, obtained through a public records request, says the NCAA could expand its investigation if it obtains new information while inspecting the program.

Penalties for recruiting violations could include a loss of scholarships and/or recruiting visits.

The NCAA told Shelton it planned to complete its investigation by May 1.