Michigan school shooting: Student kills three

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Three students have been killed and eight others injured, including a teacher, in a high school shooting in the US state of Michigan.

The dead include a 16-year-old boy, a 14-year-old girl and a 17-year-old girl, officials say.

Police say the 15-year-old suspect fired 15 to 20 shots with a semi-automatic handgun and acted alone.