Authorities say a 15-year-old sophomore opened fire at his Michigan high school, killing three other students and wounding six other people, including a teacher.
Oakland County Undersheriff Mike McCabe said at a news conference that he didn't know what the assailant's motives were for the attack Tuesday afternoon at Oxford High School in Oxford Township, a community of about 22,000 people roughly 30 miles north of Detroit.
Authorities arrested the suspect at the school and recovered a handgun. They didn't immediately release the names of the suspect or victims.
A medical helicopter landed shortly after 2 p.m. in the parking lot of the school.
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The school was placed on lockdowns, with some students sheltering in locked classrooms. They later were ushered to the parking lot of a nearby store after police secured the school and took the suspect into custody.