"The quick, fearless actions of Dixon Police Department School Resource Officer Mark Dallas stopped the gunman and saved many lives", said IEA President Kathi Griffin. The officer followed the suspect who shot at him several times during the pursuit, but did not manage to strike the officer.
According to the city of Dixon website, the school resource officer position was started by the Dixon Police Department in 2000 to help prevent school violence. Dixon Police Chief Steven Howell said, "We are forever indebted to him for his service and his bravery".
Matthew Milby fired several shots near the west gym, was confronted by Dallas and started running west on Armory Drive. The man suffered non-life threatening injuries and was taken into custody just west of the school.
The gunman ran when he saw the officer, who chased after him.
"A lot of things went right today and many things could have gone wrong", Dixon Mayor Liandro Arellano Jr., told reporters at a news conference outside the school.
Danny Langloss, Dixon City Manager tweeted "So grateful for the heroic actions of the Dixon police officer who stopped the armed gunman at Dixon high school. Because of his heroic actions, many lives were saved", Howell said.
Howell praised the officer for saving lives. Thursday classes have been canceled at the high school, although seniors will return for graduation practice at 1 p.m. Pre-K through eighth-grade classes will be held as usual, with a heightened police presence, Dixon School District 170 posted on its website.
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The identities of the school officer and the 19-year old suspect have not yet been released.
Police have not released a motive for the shooting, and their investigation is continuing into the attack.
Howell said that students and staff at the school appeared to have acted coolly under stress during the incident.
The shooting happened shortly after 8 a.m. Wednesday. When officers went inside the high school, they said they saw students and teachers barricaded in their classrooms as they should have been.
The gunman opened fire on an officer at the school, firing multiple rounds, officials said.
Dallas was placed on administrative leave as per protocol, police confirmed.