A tribal policeman shot and killed a 17-year-old boy Oct. 1 after he allegedly threatened the officer with a knife. Charles Diello was killed inside his mobile home in Cherokee after his mother called police, saying he was threatening to harm himself with the knife, WLOS in Asheville reported. At least four officers came to the home in the early morning hours. The boy's mother confirmed that her son threatened the officers with the knife, the television station reported. The officer who shot Diello was placed on administrative leave for 30 days. His identity has not been made public. Marion Teesateskie, a police spokeswoman, said officers have to protect themselves in such situations. She also said the band trains its officers extensively to deal with aggressive behavior by criminal suspects. FBI agents will review the shooting and handling of the case because the shooting involved a tribal officer on a federal reservation.