News 12's Elizabeth Hashagen was joined by Dr. Chethan Sathya, the director of Northwell's Center for Gun Violence Prevention and associate medical director of trauma and pediatrics at Cohen Children's Medical Center, and Family & Children's Association president/CEO Jeffrey Reynolds to talk about gun violence as a public health issue.

On Tuesday, a 15-year-old sophomore opened fire at his Michigan high school, killing four students, including a 16-year-old boy who died in a deputy’s patrol car on the way to a hospital, authorities said.

Other people were wounded, some critically, including a 14-year-old girl who was placed on a ventilator after surgery. Investigators were still trying to determine a motive for the shooting Tuesday at Oxford High School, located in a community of about 22,000 people roughly 30 miles north of Detroit, Oakland County Sheriff Michael Bouchard said.

Deputies rushed to the school around lunch time as more than 100 calls flooded 911 dispatchers with reports of a shooter. They arrested the student in a hallway within minutes of their arrival. He put his hands in the air as deputies approached, Bouchard said.

The boy's father on Friday bought the 9 mm Sig Sauer used in the shooting, Bouchard said. He didn't know why the man bought the semi-automatic handgun, which his son had been posting pictures of and practicing shooting, Bouchard said.