Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Input: Loudoun County has suspended all law enforcement training exercises in schools after explosive material was left on a bus following a CIA training exercise. (Ashleigh Joplin/The Washington Post) 
  
 Loudoun County has suspended all law enforcement training exercises in schools after explosive material was left on a bus following a CIA training exercise. (Ashleigh Joplin/The Washington Post) 
  
 The CIA left “explosive training material” under the hood of a Loudoun County school bus after a training exercise last week, a bus that was used to ferry elementary and high school students to and from school on Monday and Tuesday with the material still sitting in the engine compartment, according to the CIA and Loudoun County officials. 
  
 The Loudoun County Sheriff’s Office and the CIA said in statements Thursday that the explosive material was left behind after a training exercise at Briar Woods High School during spring break. The CIA said it was a training scenario for explosives-detecting dogs. 
  
 CIA officials said in a statement that the material “did not pose a danger to passengers on the bus,” which was used on March 28 and 29. Authorities held a joint training program at Briar Woods from March 21 to 24. 
  
 [‘Eyewash’: How the CIA deceives its own workforce about operations] 
  
 Loudoun schools spokesman Wayde Byard said the CIA indicated the nature of the material but asked the school system not to disclose it. Byard described it as a “putty-type” material designed for use on the battlefield and which requires a special detonator; such putty, or plastic, explosives — including the well-known C-4 — are used in demolition and are considered stable. 
  
 Byard said law enforcement agencies use school facilities on occasion to conduct realistic training exercises, including active-shooter drills. 
  
 As part of last week’s training exercise, CIA trainers placed explosive material into the engine compartment of a school bus on Thursday to test a dog’s ability to sniff it out. They also placed the material in parts of the school. Byard said the dog successfully found the material in the engine compartment, but some of the material fell deeper inside the compartment and became wedged beneath the hoses. 
  
 He said school bus drivers check under the hoods of their buses before they take them out on the road, but the package was wedged too far deep inside the engine compartment and was the same color as the hoses, so it could not easily be seen. 
  
 The bus shuttled students to and from school for two days with the explosive material under the hood, making eight runs totaling 145 miles and carrying 26 students attending Rock Ridge High School, Buffalo Trail Elementary School and Pinebrook Elementary School. 
  
 The bus was taken to a school system facility on Wednesday for routine maintenance. Byard said the county’s buses are regularly taken off-line to check their spark plugs, hoses and to rotate tires. It was during a routine inspection that a technician discovered the explosive material. 
  
 The school system immediately notified the county sheriff’s office and the fire marshal, who removed it. The CIA also helped remove the material. 
  
 “The training materials used in the exercises are incredibly stable and according to the CIA and Loudoun County explosive experts the students on the bus were not in any danger from the training material,” according to a Sheriff’s Office statement. 
  
 Officials said they checked all other buses at the school as a precaution. 
  
 School officials on Thursday met with the CIA, Loudoun County Sheriff’s Office, the fire marshal and county administrators and determined that all law enforcement training exercises at schools would be suspended until stronger protocols are established. 
  
 “We’re all very upset by what happened, but we’re going to review everything that did happen,” Byard said. “Obviously we’re concerned. The CIA really expressed its deep concern and regret today, and it was sincere.” 
  
 CIA officials acknowledged the error in a statement and confirmed that an agency canine unit ran a training exercise with local agencies last week in the county. Agency officials said they were notified by Loudoun officials Wednesday and coordinated with them to recover the material. 
  
 The intelligence service said that both CIA and Loudoun County experts said the explosive material did not pose a danger to passengers on the bus. The agency statement said they would take “immediate steps to strengthen inventory and control procedures in its K-9 program” and that they will investigate the canine training program. 
  
 The CIA said in the statement that the agency accounted for all training explosives after performing a full inventory Thursday. ||||| Kids in a northern Virginia public school district unknowingly rode a school bus this week that was also carrying “explosives training materials” left behind by the CIA after it conducted exercises with local law enforcement agencies, officials acknowledged Thursday. 
  
 The materials were packed in a container and placed in the engine compartment of a bus at Briar Woods High School in Loudoun County on March 24, officials said. It was discovered nearly a week later during a maintenance check of the bus – which by then had carried dozens of kids, including elementary school students, for at least two days. 
  
 “During the exercise, explosive training material was inadvertently left by the CIA K-9 unit in one of the buses used in the exercise,” the CIA said in a statement, which also stated the materials did not pose a danger to anyone riding the bus. 
  
 After Wednesday’s discovery, local law enforcement officials and eventually the CIA were called to retrieve the materials. Both the CIA and local officials, including the Loudoun County Sheriff’s Office and the Fire Marshal, which had also taken part in the exercises, declined to give a more precise description of the materials after meeting with school officials Thursday. 
  
 “The exact nature of the training material used in this exercise is not being released at the request of the CIA so as not to compromise its training techniques,” county officials said. 
  
 Officials said the material had fallen out of the container and into the engine compartment, where it went uncollected – and unnoticed - for nearly a week. 
  
 Last week was spring break in the district, but the bus was in service on Monday and Tuesday, making eight runs totaling 145 miles, and carrying 26 students attending Rock Ridge High School, Buffalo Trail Elementary School and Pinebrook Elementary School, school officials said. 
  
 After the discovery, school officials sent out an email to parents of students in the district, but the alert was short on answers and left many parents wanting a fuller explanation. 
  
 “During a routine maintenance procedure Wednesday, a Loudoun County transportation employee found an explosive training material on a school bus used in an exercise by a Federal Government agency last week,” the initial email stated. “The explosive training material was in a benign state and could not be activated through normal operation of the bus.” 
  
 One parent of a Buffalo Trail pupil, who asked not to be named, told FoxNews.com she did not understand why the CIA was conducting training on school grounds, and said she was dubious about the explanation of what was left behind. 
  
 “What are ‘explosives training materials’ anyway?” she said. “That could mean a lot of things, none of which belong on a school bus.” 
  
 CIA officials said the training was routine and part of exercises its personnel do with local law enforcement throughout the metro area. |||||
Output:
As a parent, it's not exactly an email you want to get from your child's school district: For almost a week, "explosive training material" was left under the hood of a school bus in Loudoun County, Va., that carried dozens of kids while the material was inside. The CIA performed training exercises with local law enforcement agencies at a high school during the school's spring break from March 21 to March 24 and placed the material into the engine compartment of the bus in order to test a dog's ability to detect the scent there, the Washington Post reports. But some of the material (a school spokesperson describes it as a "putty-type" explosive that requires a special detonator) fell further down into the compartment and was not removed until a routine maintenance check on Wednesday uncovered it. While the material was still in the bus, it made eight runs for a total of 145 miles and carried 26 students from elementary school age to high school age. Parents were informed of the mix-up in an email, Fox News reports, but the email was short on details, and many parents were left wanting better answers. "What are 'explosives training materials' anyway?" says one. "That could mean a lot of things, none of which belong on a school bus." The CIA, which helped the local sheriff's office and fire department remove the material from the bus Wednesday, says in a statement that the material "did not pose a danger to passengers on the bus." The Post notes that "putty, or plastic, explosives ... are used in demolition and are considered stable," and NBC Washington reports that, per a school spokesperson, no detonator or triggering device was included with the explosive material, so it was considered inert and benign.