A fourth
student has died from the wounds sustained during the school shooting in
Michigan’s Oakland County, authorities confirmed on Wednesday. The deceased was
identified as 17-year-old Justin
Shilling by the Oakland County sheriff’s office.

The shooting, by a 15-year-old sophomore, occurred
at the Oxford High School on Tuesday and wounded seven others, including some who
were critically injured. A 14-year-old girl had to be placed on ventilator after
undergoing surgery.

The other deceased include a 16-year-old
boy who died en route to the hospital in a deputy’s patrol car.

Investigators
are yet to determine the motive behind the shooting, Oakland County Sheriff
Michael Bouchard said. “The person that’s got the most insight and
the motive is not talking,” he said at a presser on Tuesday.

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Deputies rushed to the school, located in a
community of about 22,000 people around 30 miles (48 kilometres) north of
Detroit, at around lunchtime after over 100 calls flooded 911 dispatchers with
reports of a shooting.

The student was arrested in a hallway
within minutes of their arrival, putting his hands in the air as deputies approached,
Bouchard said. He used a 9mm Sig Sauer his father had bought last Friday in the
shooting.

Authorities don’t know why the man bought
the semiautomatic handgun, which his son has posted with and has used for
practising shooting, Bouchard said. The gun had seven more rounds of ammo in it
when he surrendered. 

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The shooter’s name has not been released by
the authorities yet.

The four students who were killed were
16-year-old Tate Myre, 14-year-old Hana St. Juliana, 17-year-old Madisyn
Baldwin and Justin Shilling, who died Wednesday.

A teacher who received a graze wound to the
shoulder left the hospital, but seven students ranging in age from 14 to 17
remained hospitalized through the night with gunshot wounds, he said.

(With inputs from the Associated Press)