(CNN) -
Ethan Crumbley was charged as an adult with terrorism and first-degree murder, among other charges in connection with the deadly shooting at Oxford High School in Michigan.
Specifically, he is charged with one count of terrorism that caused death, four counts of premeditated murder, seven counts of assault with intent to murder and 12 counts of possession of a firearm in the commission of a felony, said the Wednesday Karen D. McDonald, Oakland County Attorney.
The seriousness of the crime, the events that led to the shooting and that suggest that "it is not a simple impulsive act", as well as the need to press charges as an adult to "achieve justice and protect the public", were the reasons why who decided to accuse him as an adult, he said.
According to McDonald, more charges could be brought soon as the investigation continues to unfold and these are just the initial charges.
The prosecutor stressed that she would only name the suspect once at the beginning of the press conference, so that the focus would return to the victims.
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It will be processed the afternoon of this Wednesday.