(CNN) -- At least nine people were injured Tuesday evening when lightning hit a soccer field in Portage, Michigan, authorities said.
The injured were a mix of adults and students, said Charles Wellman, the Portage battalion chief.
Seven people -- one with serious injuries -- were transported to area hospitals, with two others seeking medical treatment on their own, he said.
Portage is six miles south of Kalamazoo in southwestern Michigan.
