Police say a motive for the shooting was not immediately known, nor was it clear if the victims were targeted.

Police at one point said the fatalities included four victims plus the shooter, but later lowered the number to two. Madison Fire Chief Chris Carbon said four people were transported to SSM Health St. Mary's Hospital, while others were taken to University of Wisconsin hospitals.

The shooter was a 15-year-old student, officials said on Monday. Natalie Rupnow, who went by Samantha, died of an apparent self-inflicted gunshot wound.