Definition: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Flowers decorate a fence outside Ft. Hood's east gate in Killeen, Texas, in honor of those killed and wounded in Wednesday's shooting. (Tamir Kalifa / Associated Press / ) 
  
 FT. HOOD, Texas — Military investigators provided a step-by-step account Monday of the shooting at this massive central Texas Army base last week that left three soldiers and the gunman dead and 16 wounded. They also confirmed that a dispute precipitated the deadly incident. 
  
 Officials had already shared the attack's basic chronology: Spc. Ivan Lopez, 34, opened fire about 4 p.m. on Wednesday, traveling from building to building and firing from his car until encountering a female military police officer, who shot at him before he took his own life. 
  
 A spokesman for the military’s Criminal Investigation Division provided more details Monday about Lopez’s movements, but said the soldier's motive remains a mystery. 
  
 “We may never know why,” spokesman Chris Grey said. 
  
 Grey did not identify any of the other soldiers involved as he retraced Lopez’s movements using a large map based on an analysis of the crime scene, evidence and interviews with more than 1,000 people. 
  
 He said the attack began after Lopez was involved in a “verbal altercation concerning his request for leave and the processing of his request at his unit’s administrative office." 
  
 Within minutes of the argument, Lopez brandished a .45-caliber semiautomatic pistol and shot several soldiers at the administrative building, one of whom was killed. 
  
 He then climbed into his car and drove slowly off, heading the wrong way down a nearby street, according to witnesses. He fired from his vehicle at two soldiers standing behind a building, wounding one. 
  
 Lopez then parked outside the motor pool office where he worked. Once inside, Lopez opened fire, wounding three more soldiers, one of whom later died. 
  
 He left and drove toward a medical building, shooting through the windshield of an oncoming car and wounding the passenger, another soldier. 
  
 At the medical building, Lopez shot and wounded a soldier outside, then killed the soldier on duty at the front desk and wounded another soldier before he left. 
  
 He then drove to a nearby parking lot where he approached a female military police officer. The two spoke briefly. When Lopez wielded his pistol, she drew her weapon and fired a single round. 
  
 Autopsy results show Lopez was not struck by that bullet. 
  
 Instead, he placed his pistol to his head and shot himself. 
  
 The entire incident unfolded in about eight minutes. In that time, Lopez fired more than 35 rounds, Grey said. Lopez had no criminal record, he said. 
  
 Investigators think that Lopez acted alone and that the attack was unrelated to terrorism, unlike the last mass shooting at Ft. Hood in 2009 by Maj. Nidal Malik Hasan, who said he was defending the Taliban when he killed 13 fellow soldiers and wounded more than 30. 
  
 Grey said investigators finished work at the crime scene Monday. 
  
 “We sincerely hope that our efforts to diligently seek the truth will in some small way provide comfort to the families of the deceased and wounded,” Grey said. 
  
 Three sergeants were killed in the attack: Danny Ferguson, 39, of Mulberry, Fla.; Timothy Owens, 37, of Effingham, Ill.; and Carlos Lazaney, 38, of Aguadilla, Puerto Rico. Their bodies were being transported home this week, Col. Paul P. Reese said at Monday’s briefing. 
  
 Grey did not say where each of the soldiers was killed, but Ferguson had worked in transportation administration, Owens in the motor pool and Lazaney in a medical brigade, according to military records. ||||| Specialist Lopez’s assault started at about 4 p.m. inside the administrative office of his unit, the 49th Transportation Battalion, said Chris Grey, a spokesman for the United States Army Criminal Investigation Command, the lead agency investigating the shooting. Investigators have not yet established a clear motive, but the catalyst appeared to be an argument Specialist Lopez had with soldiers from his unit about his request for a leave of absence to attend to family matters. In that argument, he expressed anger over the processing of the request, officials said. One of the soldiers in that meeting, Sgt. Jonathan Westbrook, described the specialist as “irate.” 
  
 Minutes after the altercation, Specialist Lopez left the building and then returned, firing multiple rounds from his .45-caliber semiautomatic handgun. 
  
 Sergeant Westbrook, who had served in Afghanistan, was one of the first people he shot. “He came back and fired shots,” Sergeant Westbrook, who was shot four times but survived, said in a telephone interview with WJTV, a television station in his home state of Mississippi. “The next thing going through my head was my family: my wife, my children, my mom, my dad. Make sure that I can get safe so I can stay alive for them, and that’s what I did. And through the grace of God, I came out of there alive.” 
  
 Image Specialist Ivan A. Lopez, in a photo from his Facebook page. 
  
 In that one building, Specialist Lopez killed one soldier and wounded Sergeant Westbrook and nine others. The soldier he killed there appears to have been Sgt. First Class Daniel M. Ferguson, 39, of Mulberry, Fla., who, along with Sergeant Westbrook, had possibly been involved in the argument with Specialist Lopez about his leave request. 
  
 Sergeant Ferguson may have saved a number of other soldiers’ lives before he died. He was in a room filled with other soldiers when Specialist Lopez tried to force his way through a door that could not be locked. Sergeant Ferguson, a Bronze Star recipient who deployed to Afghanistan and Iraq, pressed his body against the door, preventing Specialist Lopez from gaining entry, his fiancée told a Florida television station. Specialist Lopez then shot him through the door. |||||
Output:
Specialist Ivan Lopez fired at least 35 shots during his 8-minute rampage at Fort Hood military base, killing three of his fellow soldiers and wounding 16, military investigators say in a detailed account of the shooting. The military has also confirmed that the shooting began after Lopez had an argument at his unit's administrative office over a leave request to deal with family matters, the New York Times reports. He returned with a gun minutes later and killed one person in the office and wounded nine others. Investigators believed the soldier killed in the office had been involved in the leave argument. After the office shooting, Lopez drove to the motor pool building where he worked and opened fire inside, killing one soldier from his unit and wounding two others. He then drove to a medical building, firing as he went, and killed one more soldier inside. "We do not know why he entered that building, and we may never know why," a spokesman for the United States Army Criminal Investigation Command says. The spokesman says retracing the gunman's movements involved interviews with more than 1,000 soldiers, reports the Los Angeles Times. While Lopez's motive is still unclear, "we sincerely hope that our efforts to diligently seek the truth will in some small way provide comfort to the families of the deceased and wounded," he says.