A ring accused of helping people from the Middle East obtain student visas by taking their proficiency exams and classes has exposed vulnerability in the nation's security tracking system for foreigners who attend U.S. schools, experts said Tuesday.

The bust unsettled immigration authorities and federal lawmakers who implemented the sophisticated Foreign Student and Exchange Visitor Information System after learning one of the Sept. 11 hijackers had entered the U.S. on a student visa.

The Associated Press

Interior Enforcement
Illegal Immigration

Updated: Wed, Mar 10th 2010 @ 1:56pm EST