DIXON, Ill. – The Latest on a shooting at a northern Illinois high school (all times local):

3:10 p.m.

Police say a teenager used a 9mm semi-automatic rifle in firing shots at a northern Illinois high school before he was stopped by a school resource officer.

Illinois State Police said Thursday that 19-year-old Matthew Milby’s mother bought the weapon in 2012 and that investigators were working to determine how he obtained it.

Milby is being held on a $2 million bond for aggravated discharge of a firearm charges in the Wednesday morning shooting at Dixon High School. Police say he was wounded by the officer and transferred Thursday from a hospital to jail.

No one else was injured at the school about 80 miles (130 kilometres) west of Chicago.

Sauk Valley Media reports Milby was convicted in April of marijuana possession and fined $120.

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12:55 p.m.

Authorities say a teenager accused of firing shots at a northern Illinois high school while his classmates rehearsed for graduation has been transferred from a hospital to jail.

The Dixon Police Department said Thursday that 19-year-old Matthew Milby has been processed into the Lee County Jail.

Milby is charged with aggravated discharge of a firearm in the Wednesday morning shooting at Dixon High School. He is being held on a $2 million bond.

A school resource officer shot Milby after the teenager fired several shots on the school grounds. Milby was hospitalized with non-life-threatening injuries. No one else was injured.

Classes were cancelled Thursday at Dixon High, about 80 miles (130 kilometres) west of Chicago.

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10:50 a.m.

The mother of the teenager charged with firing shots at a northern Illinois high school says he was ostracized and bullied by classmates.

Authorities say 19-year-old Matthew Milby suffered non-life-threatening injuries Wednesday when he was shot by a school resource officer outside Dixon High School. Police say Milby fired several shots on school grounds as seniors rehearsed for graduation. No one else was injured.

Julie Milby told reporters her son was recently beaten up, other students stole from him and he was kicked off the football team for smoking marijuana. She says he was supposed to graduate Sunday.

Dixon senior Brianna Johnson says Milby seemed nice but was recently angry all the time.

Classes were cancelled Thursday at the high school about 80 miles (130 kilometres) west of Chicago.