MEMPHIS, Tenn. (AP) — A 17-year-old suspect charged in the fatal shooting of a Memphis police officer has not been accused of first-degree murder because information obtained by the district attorney’s office shows the officer was killed by friendly fire, officials said.

In a statement, the office of Shelby County’s top prosecutor said the 17-year-old has been charged with 13 counts including attempted first-degree murder and assault against a first responder in the death of Officer Joseph McKinney on April 12.

McKinney and an 18-year-old man, identified as Jaylen Lobley, were killed in a shootout that developed as officers investigated a suspicious vehicle. The 17-year-old suspect was wounded and remains in the hospital. Another Memphis police officer was injured and a third officer was grazed and treated at the scene.

The DA’s office did not identify the 17-year-old suspect in statements released Wednesday about the charges, which carry up a maximum of 400 years in prison. The statements did not provide details about friendly fire aspect of the shooting.