UPDATE: (CROSSVILLE) The 7-year-old boy accidentally shot in the head Monday by one of his siblings has died, according to Crossville police. 
 
 The outlook for the unidentified child had been serious from the start, according to authorities. 
 
 Police confirmed his death about 8:45 p.m. Monday. He was taken to a Knoxville area hospital. 
 
 A University of Tennessee Medical Center spokeswoman said she could not confirm if the child had been taken there. 
 
 The shooting happened Monday afternoon as four children sat in a vehicle outside a Verizon store in Crossville. 
 
 The mother and stepfather had gone inside to pay a bill. One of the children found a loaded gun in the mother's purse. 
 
 Police said the child tried to unload the gun. The weapon went off and hit the boy in the head. 
 
 The Cumberland County District Attorney General"s Office and the Department of Children’s Services were investigating. 
 
 A Verizon spokesperson declined to comment. 
 
 PREVIOUS STORY: A 7-year-old boy was accidentally shot in the head by one of his siblings after their parents left them unattended in a car Monday afternoon, according to the Crossville Police Department. 
 
 According to a news release, four children had been left in a vehicle while their mother and step-father went inside a business to pay a bill. 
 
 During that time, investigators discovered that one of the children found a loaded semi-automatic pistol inside their mother's purse. When the child tried to remove the magazine, the firearm discharged and struck the 7-year-old male victim. 
 
 Emergency responders arrived and found the victim was bleeding from the head. 
 
 The victim was flown to a Knoxville area trauma hospital for treatment. 
 
 The Cumberland County District Attorney General's Office and the Department of Children's Services have been notified and are involved in the investigation. 
 
 Crossville Police described the incident as a "tragic accidental shooting." ||||| Story highlights 4-year-old girl fatally shoots 4-year-old cousin, police say 
 
 Detroit police: Children found "long gun" under bed 
 
 Police say incident appears to be tragic accident 
 
 A 4-year-old boy was shot and killed by his 4-year-old female cousin while they were playing with a gun, Detroit police said. 
 
 The shooting happened Thursday in a home on the city's west side. 
 
 There were three children -- all cousins -- at the home at the time of the incident, said Detroit Deputy Chief Rodney Johnson. The third child was 5, he said. 
 
 Detroit Police Public Information Officer Adam Madera said the children found a "long gun" under a bed, pulled it out and began to play with it. 
 
 "At this time, although it's early in the investigation, this appears to be a tragic accident," Madera said. 
 
 There was an adult present in the house, but that person was a family friend and unrelated to the children, Johnson said. 
 
 "It's too early to say if charges will be filed in this case," Johnson said. 
 
 This is the latest incident involving children who accidentally shoot someone or die of a self-inflicted gunshot wound. 
 
 In October, a babysitter in Vidor, Texas , was charged after her 5-year-old charge fatally shot himself with her gun, police said. 
 
 Two weeks earlier, a 2-year-old girl fatally shot herself in Fayetteville, North Carolina, and the toddler's father faced involuntary manslaughter charges, police said. 
 
 In New Orleans, a 5-year-old girl died June 23 after she came into contact with a .38-caliber revolver and accidentally shot herself in the head while her mother was at a store, police said. 
 
 Last August, a 3-year-old boy in Dundee, Michigan, found a .40-caliber handgun belonging to a family friend on a closet floor in his home. He died after accidentally shooting himself in the head, police said. 
 
 During the same period, 7,766 children under the age of 14 suffered accidental firearm injuries.
– A 7-year-old boy is dead after being shot in the head by a sibling when their parents left them alone in the car Monday afternoon in Tennessee, WBIR reports. According to NBC News, four children were waiting in the car outside a Verizon store while their mother and stepfather paid a cellphone bill when one found a loaded handgun in their mother's purse. Police say the child was attempting to unload the gun when it went off in a "tragic accidental shooting." The bullet struck the 7-year-old in the head, and he died hours later at the hospital, WBIR reports. According to the Knoxville News Sentinel, authorities are not releasing the ages of the other children in the car or any of their names. The Department of Children's Services is investigating the incident, WBIR reports.