MEMPHIS (AP) — No charges have been filed against a Tennessee kindergartner or his mother after a gun discharged inside the child’s backpack in a school cafeteria, but the shooting has led to metal-detecting wands being provided to the district’s elementary schools, officials said Friday.Memphis police said the 5-year-old and his mother were released from custody late Thursday, hours after the gun went off as students were waiting for the opening bell in the Westside Elementary School cafeteria.No one was hurt, and school security officers quickly took control of the backpack. Officials have not released details, such as how the child was holding the backpack or in which direction the bullet went.Investigators determined the child obtained the gun from a closet at home and placed it in the backpack, police spokeswoman Karen Rudolph said Friday. The information was presented to the district attorney general’s office, which decided not to file charges at this time, she said.Rudolph said later Friday the district attorney’s office is still investigating the matter.Police are not releasing the identity of the child or the mother.