ST. GEORGE, Utah (AP) — Two students were arrested for using teachers' passwords to get into a computer grading system, where police say the students changed grades for others.

St. George police Sgt. James Van Fleet says the hackers were charging from $5 to $25 for their service at Snow Canyon High School.

Tanner M. Rea, 18, and a 17-year-old juvenile were arrested Tuesday.

Both told police they got hold of a list with every teacher's computer passwords.

Operating for weeks, police say, the students wrote over grades in a computer database, improving scores for at least seven others.

Rea was booked into Purgatory Correctional Facility for investigation of theft and altering a computer record.

The 17-year-old boy was booked into a juvenile detention center for investigation of similar charges.

Information from: The Spectrum, www.thespectrum.com