In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.

DNA testing has failed to link a new suspect in the D.B. Cooper hijacking to a necktie that he left behind on the plane in 1971, the FBI said Monday. 
  
 Special Agent Fred Gutt cautioned that the test does not necessarily rule out the deceased man because investigators do not know whether DNA on the tie is that of the hijacker. Gutt said there are three different DNA samples on the necktie and it's not clear where the hijacker got it. 
  
 "There are some questions about the tie itself: Was it a used tie, a borrowed tie?" Gutt said. 
  
 Investigators compared the DNA on the tie to the DNA of someone in the new suspect's family, Gutt said. A woman in Oklahoma recently came forward to say that she believes her uncle, Lynn Doyle Cooper, was the hijacker _ which she based largely on memories from when she was 8 years old. 
  
 Gutt said the FBI had an inconclusive round of fingerprint testing on a guitar strap and that investigators are now working with family members to identify other items that could be tested further for fingerprints. 
  
 Federal investigators have checked hundreds of leads since the man dubbed "D.B. Cooper" parachuted from a flight with $200,000 dollars in ransom in 1971. 
  
 Cooper claimed after taking off in Portland that he had a bomb, and officials met his demands for parachutes and ransom money when the plane landed in Seattle. After ordering the flight back into the air, Cooper apparently jumped from the plane around the Washington-Oregon border. 
  
 FBI investigators have questioned over the years whether Cooper could have survived. Marla Cooper, the woman who believes her late uncle is the hijacker, recalled seeing him arrive at a family home in Oregon with serious injuries. 
  
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 Associated Press writer Mike Baker can be reached at http://twitter.com/MikeBakerAP ||||| LOS ANGELES | 
  
 LOS ANGELES (Reuters) - DNA analysis has failed to establish a link between the skyjacker dubbed D.B. Cooper and a new suspect in the decades-old case, but the results do not rule out that he may have been the culprit, the FBI said on Monday. 
  
 The FBI's disclosure came days after an Oklahoma woman came forward to say she believes her late uncle, Lynn Doyle Cooper, was the mysterious man who hijacked a Pacific Northwest flight in 1971 and then vanished. 
  
 The FBI declined to say if the suspect whose DNA was checked against that of the hijacker was Lynn Doyle Cooper, but the circumstances appeared to match. 
  
 The FBI has a necktie the hijacker is believed to have worn, and DNA taken from a family member of the latest suspect did not match the DNA on the tie, said FBI Special Agent Fred Gutt, a spokesman for the bureau's Seattle office. 
  
 "He's not been ruled out," Gutt said. 
  
 That is because there are strands of DNA from three different people on the necktie, which could have been bought at a second-hand store, Gutt said. 
  
 "We don't even know if (any of the strands of DNA) belong to the hijacker," he said. 
  
 A man who in 1971, under the name Dan Cooper, bought a plane ticket in Portland, Oregon, for a Seattle-bound flight on Northwest Orient Airlines seized control of the plane by claiming to have a bomb. 
  
 He freed passengers after landing in Seattle in exchange for $200,000 from the airline. Then he ordered the plane to take off again, and jumped out of the aircraft with the cash and a parachute. 
  
 The suspect name "D.B. Cooper," rather than "Dan Cooper," came from media reports about the case. 
  
 Marla Wynn Cooper, 48, of Oklahoma City said last week that she recalls her uncle, Lynn Doyle Cooper, arriving bloody and bruised to a family gathering soon after the hijacking. 
  
 She also said that conversations she overheard at the time between him and another family member suggest that they had plotted the hijacking. 
  
 Marla Wynn Cooper said she believes her uncle died in 1999. She said on Monday that the FBI would like to run more tests, to compare fingerprints lifted in 1971 from the hijacked airliner to any prints her uncle may have left at the last place he lived, a home near Reno, Nevada. 
  
 But first, investigators would need to obtain fingerprints from that home, she said. 
  
 "There's no way to prove the case unless they do that," Marla Cooper said. 
  
 (Reporting by Laura L. Myers and Steve Olafson, writing by Alex Dobuzinskis: Editing by Dan Whitcomb and Cynthia Johnston) |||||
DNA testing has failed to establish a link between a new suspect in the DB Cooper case and the man who vanished after hijacking a plane 40 years ago, the FBI says. DNA from family members of the suspect, who died 10 years ago, failed to match any of the strands of DNA from three different people found on a necktie believed to have been worn by the hijacker, reports the AP. The FBI says it hasn't ruled out the new suspect, however, as there is no proof that any of the DNA on the tie belonged to the hijacker, Reuters notes. "There are some questions about the tie itself," said a special agent. "Was it a used tie, a borrowed tie?" Investigators are working with the suspect's family members to obtain fingerprints to compare to those left behind after the man known as DB Cooper parachuted from a plane with $200,000 in cash.