The University of Iowa campus.

John Schultz / QUAD-CITY TIMES FILE PHOTO

IOWA CITY — Officials say some students used stolen teacher passwords to change some grades at the University of Iowa.

The officials said Thursday the university is investigating about 250 cases in which university IDs and login information were taken by unauthorized devices that had been attached to university computers in classrooms and computer labs. Officials are encouraging students, faculty and other staff members to change their passwords.

University staffers are checking computers for suspicious devices and developing plans to increase security measures.

Officials say that if investigation determines a student has cheated, university disciplinary action could include expulsion or suspension.

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