TUCSON, Ariz. — The Arizona Attorney General's Office has asked Pima Community College why it's offering discounted tuition to immigrant students brought to the U.S. illegally as children.

The college in Tucson recently received a letter from Attorney General Tom Horne's office.

Horne wants an explanation for the PCC Governing Board's decision to charge in-state tuition rates to students who obtain work permits under the federal Deferred Action for Childhood Arrivals program.

Horne already is suing Maricopa County's community college system for doing the same thing.

About 150 such students have enrolled at Pima Community at in-state tuition rates since the board approved the practice in February.

About 27,000 students are attending the college in the current fall semester.

The federal program that aids young immigrants began last year.