Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: A 29-year-old Army veteran allegedly killed his mother and rode a tractor through his Simi Valley neighborhood, firing rounds, before police killed him Saturday. Detectives on Sunday were piecing together details about the incident. Jane Yamamoto reports from Simi Valley for NBC4 News at 11 p.m. on Sunday, Aug. 25, 2013. (Published Sunday, Aug. 25, 2013) 
  
 A man fatally shot by police after he possibly killed his mother and rode through a neighborhood firing a gun from a tractor was identified on Sunday as a veteran of the U.S. Army. 
  
 Ryan Carnan, 29, (pictured) was fatally shot by Simi Valley police officers on Saturday afternoon, officials said. 
  
 Wild Standoff Ends with Gunman Dead 
  
 Police in Simi Valley are now investigating the background of a man killed by officers after a wild standoff. Detectives believe the man killed his mother, then opened fire on others in her neighborhood while fleeing on a tractor. Jane Yamamoto reports for the NBC4 News at 8 p.m. on Sunday, Aug. 25, 2013. (Published Sunday, Aug. 25, 2013) 
  
 The events prompted a bomb-squad callout and the evacuation of homes in the Bridal Path neighborhood of Simi Valley, 30 miles northwest of downtown Los Angeles. 
  
 It started with a call to police from the suspect's brother about the killing of their mother, a house fire, the discovery of a woman's body inside the home and calls from residents reporting a man driving through on a tractor firing a gun. 
  
 Police Kill Gunman, Find Mother's Body After Standoff 
  
 Police fatally shot a gunman who was believed to have killed his own mother and ridden a tractor through a Simi Valley neighborhood, firing his weapon, Saturday night. Jane Yamamoto reports from Simi Valley for NBC4 News at 11 p.m. on Saturday, Aug. 24, 2013. (Published Saturday, Aug. 24, 2013) 
  
 He reportedly aimed the gun at residents he encountered on the street. 
  
 The identity of the woman and the cause of her death have not been confirmed, police said. But police said they believe it's Carnan's mother - an administrator at Santa Susana High School. 
  
 Southern California Police Standoffs 
  
 An autopsy was scheduled to be performed on the victim Monday. 
  
 Police shot the suspect when "the officers were confronted with a deadly force situation," the Simi Valley Police Department said in a press release. 
  
 "Based on the information that was being received by the 911 callers that a subject was actively shooting a firearm in a residential neighborhood, the heroic actions of the officers involved cannot be understated," the press release said. 
  
 Residences in the area were evacuated as a precaution as a bomb squad checked the home after the fire was put out. 
  
 The officers are home on paid administrative leave pending the outcome of parallel probes into the shooting by the Simi Valley Police Department and the Ventura County District Attorney’s Office. 
  
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 Grief counselors were expected Monday to arrive at a Southern California high school to help students and staff cope with the death of an employee who was killed allegedly by her son who was fatally shot by police. 
  
 Mourners placed flowers outside Santa Susana High School for Sally Carnan, who worked in the attendance office at the Ventura County school. 
  
 "We loved her. Everyone loved her," said Cassie Sadowsky, a former student, of the 67-year-old woman affectionately known as "The Attendance Lady." 
  
 Carnan's son, Ryan, allegedly killed his mother, set their house on fire, then fired at neighbors and police from a tractor before he was fatally shot by officers on Saturday, authorities said. His mother's body was found inside the home, police said. 
  
 Autopsies to reveal details about the deaths were set for Monday. 
  
 Carnan, 29, (pictured) had no criminal record with Simi Valley police, officials said. But police were called to the house at least five times, the most recent in 2008. 
  
 "Those were mental-health related calls," said Cmdr. Stephanie Shannon, of the Simi Valley Police Department. 
  
 A family friend said Ryan Carnan was discharged from the U.S. Army five years ago, around the same time his father died of cancer. Results from an request with the military were not immediately available. 
  
 "They 're kinda overcome with everything that's happened," said Brandon Lyman, the family friend. 
  
 The incident Saturday started with a call from Ryan Carnan's brother to police, saying Ryan Carnan brother shot their mother, police said. 
  
 The call prompted a call to the fire department and a bomb-squad, fearing incendiary devices and the evacuation of homes in the Bridal Path neighborhood of Simi Valley, 30 miles northwest of downtown Los Angeles. Ryan Carnan lived with his mother at a home nearby on Mellow Lane. 
  
 He reportedly aimed the gun at residents and police from a tractor, officials said. 
  
 Police shot Ryan Carnan when they said they were confronted with a "dangerous and deadly situation." 
  
 The officers are home on paid administrative leave pending the outcome of parallel probes into the shooting by the Simi Valley Police Department and the Ventura County District Attorney’s Office. 
  
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A:
A 29-year-old Army veteran allegedly murdered his mother, set her house on fire, and then fired at residents in Simi Valley, Calif., while driving a tractor before being shot dead by police Saturday, NBC Los Angeles reports. Police were alerted to the situation by Ryan Carnan's brother, who reported their mother had been killed, and by neighborhood residents who spotted a shooter atop a tractor. ABC 7 reports that Carnan allegedly shot at a bicyclist as well as others; police say they shot Carnan after he opened fire on them. Carnan's brother told authorities his brother confessed to shooting and killing their mother, whose body was found inside the burning home, though her cause of death has not been officially verified. No one else was injured. Police aren't sure of Carnan's motive or what led up to the shootings. He had been stationed in Korea at some point, and police had been called to the family home three times over concerns about his mental health, though the last of those calls reportedly occurred five years ago. NBC Los Angeles notes that Sally Carnan was a beloved employee of Santa Susana High School, where she was known as the "Attendance Lady."