MH370 investigators say controls were likely deliberately manipulated

Investigators released a report on missing Malaysia Airlines flight MH370 on Monday, saying the Boeing 777's controls were likely deliberately manipulated to take it off course but they were not able to determine who was responsible.

They had no conclusion about what happened aboard the plane that vanished with 239 people on board en route to Beijing from Kuala Lumpur on March 8, 2014, leaving one of the world's greatest aviation mysteries unsolved.

"The answer can only be conclusive if the wreckage is found," Kok Soo Chon, head of the MH370 safety investigation team, told reporters.

On May 29, Malaysia called off a three-month search by U.S. firm Ocean Infinity, which spanned 112,000 sq km (43,243 sq miles) in the southern Indian Ocean and ended with no significant findings.

It was the second major search after Australia, China and Malaysia ended a fruitless A$200 million ($147.06 million) search across an area of 120,000 sq km (46,332 sq miles) last year.

Malaysian and international investigators have been looking into why the Boeing 777 jet veered thousands of miles off course from its scheduled route before eventually plunging into the Indian Ocean.

Experts believe someone may have deliberately switched off MH370’s transponder before diverting it over the Indian Ocean.

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Malaysia MH370 debris found
Joao de Abreu, President of Mozambique's Civil Aviation Institute (IACM), holds a piece of suspected aircraft wreckage found off the east African coast of Mozambique at Mozambique's Civil Aviation Institute (IACM) in Maputo on March 3, 2016. A hunk of suspected aircraft wreckage found off the east African coast will be sent to Australia where experts will examine whether it is a new piece in the puzzle of missing flight MH370, officials said. The fragment was reportedly found near Mozambique and could provide clues in the huge and costly Australia-led investigation into what happened to the ill-fated Malaysia Airlines flight that disappeared nearly two years ago. / AFP / ADRIEN BARBIER (Photo credit should read ADRIEN BARBIER/AFP/Getty Images)
Joao de Abreu, president of Mozambique's Civil Aviation Institute (IACM), holds a piece of suspected aircraft wreckage found off the east African coast of Mozambique at Mozambique's Civil Aviation Institute (IACM) in Maputo on March 3, 2016. A hunk of suspected aircraft wreckage found off the east African coast will be sent to Australia where experts will examine whether it is a new piece in the puzzle of missing flight MH370, officials said. The fragment was reportedly found near Mozambique and could provide clues in the huge and costly Australia-led investigation into what happened to the ill-fated Malaysia Airlines flight that disappeared nearly two years ago. / AFP / ADRIEN BARBIER (Photo credit should read ADRIEN BARBIER/AFP/Getty Images)
A photo taken on March 3, 2016 shows a piece of suspected aircraft wreckage found off the east African coast of Mozambique at Mozambique's Civil Aviation Institute (IACM) in Maputo. A hunk of suspected aircraft wreckage found off the east African coast will be sent to Australia where experts will examine whether it is a new piece in the puzzle of missing flight MH370, officials said. The fragment was reportedly found near Mozambique and could provide clues in the huge and costly Australia-led investigation into what happened to the ill-fated Malaysia Airlines flight that disappeared nearly two years ago. / AFP / ADRIEN BARBIER (Photo credit should read ADRIEN BARBIER/AFP/Getty Images)
A photo taken on March 3, 2016 shows a piece of suspected aircraft wreckage found off the east African coast of Mozambique at Mozambique's Civil Aviation Institute (IACM) in Maputo. A hunk of suspected aircraft wreckage found off the east African coast will be sent to Australia where experts will examine whether it is a new piece in the puzzle of missing flight MH370, officials said. The fragment was reportedly found near Mozambique and could provide clues in the huge and costly Australia-led investigation into what happened to the ill-fated Malaysia Airlines flight that disappeared nearly two years ago. / AFP / ADRIEN BARBIER (Photo credit should read ADRIEN BARBIER/AFP/Getty Images)
Journalists stand next to a police officer holding a piece of plastic found on the sea front of Saint-Denis, on the French Indian Ocean island of La Reunion, on August 4, 2015. Last week a wing part washed up on the French Indian Ocean island of La Reunion, and has been taken to France to for physical and chemical analysis. In one of the most baffling mysteries in aviation history, MH370 inexplicably veered off course in March 2014 and disappeared from radars, sparking a colossal hunt that has until now proved fruitless. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
A police officer holds a piece of plastic found on the sea front of Saint-Denis, on the French Indian Ocean island of La Reunion, on August 4, 2015. Last week a wing part washed up on the French Indian Ocean island of La Reunion, and has been taken to France to for physical and chemical analysis. In one of the most baffling mysteries in aviation history, MH370 inexplicably veered off course in March 2014 and disappeared from radars, sparking a colossal hunt that has until now proved fruitless. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Local residents look for debris on a beach of the Etang de Bois Rouge on the sea front of Saint-Andre, on the French Indian Ocean island of La Reunion, on August 4, 2015. Last week a wing part washed up on the French Indian Ocean island of La Reunion, and has been taken to France to for physical and chemical analysis. In one of the most baffling mysteries in aviation history, MH370 inexplicably veered off course in March 2014 and disappeared from radars, sparking a colossal hunt that has until now proved fruitless. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Johnny Begue (C), who stumbled across a piece of plane wreckage from the ill-fated Malaysia Airlines flight MH370 on the beach on July 29, 2015, help repair the costline in Saint-Andre on the east of the French island of La Reunion, on August 6, 2015. The two-metre (six-foot) long piece of wing, was half covered in sand and had barnacles encrusted on its edges. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Police officers inspect metallic debris found on a beach in Saint-Denis on the French Reunion Island in the Indian Ocean on August 2, 2015, close to where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week. A piece of metal was found on La Reunion island, where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week, said a source close to the investigation. Investigators on the Indian Ocean island took the debris into evidence as part of their probe into the fate of Malaysia Airlines flight MH370, however nothing indicated the piece of metal came from an airplane, the source said. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
This picture taken on August 2, 2015 shows metallic debris found on a beach in Saint-Denis on the French Reunion Island in the Indian Ocean, close to where where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week. A piece of metal was found on La Reunion island, where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week, said a source close to the investigation. Investigators on the Indian Ocean island took the debris into evidence as part of their probe into the fate of Malaysia Airlines flight MH370, however nothing indicated the piece of metal came from an airplane, the source said. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Police officers leave the scene with container holding metallic debris found on a beach in Saint-Denis on the French Reunion Island in the Indian Ocean on August 2, 2015, close to where where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week. A piece of metal was found on La Reunion island, where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week, said a source close to the investigation. Investigators on the Indian Ocean island took the debris into evidence as part of their probe into the fate of Malaysia Airlines flight MH370, however nothing indicated the piece of metal came from an airplane, the source said. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Police officers inspect and photograph metallic debris found on a beach in Saint-Denis on the French Reunion Island in the Indian Ocean on August 2, 2015, close to where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week. A piece of metal was found on La Reunion island, where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week, said a source close to the investigation. Investigators on the Indian Ocean island took the debris into evidence as part of their probe into the fate of Malaysia Airlines flight MH370, however nothing indicated the piece of metal came from an airplane, the source said. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Police officers inspect metallic debris found on a beach in Saint-Denis on the French Reunion Island in the Indian Ocean on August 2, 2015, close to where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week. A piece of metal was found on La Reunion island, where a Boeing 777 wing part believed to belong to missing flight MH370 washed up last week, said a source close to the investigation. Investigators on the Indian Ocean island took the debris into evidence as part of their probe into the fate of Malaysia Airlines flight MH370, however nothing indicated the piece of metal came from an airplane, the source said. AFP PHOTO / RICHARD BOUHET (Photo credit should read RICHARD BOUHET/AFP/Getty Images)
Police carry a piece of debris from an unidentified aircraft found in the coastal area of Saint-Andre de la Reunion, in the east of the French Indian Ocean island of La Reunion, on July 29, 2015. The two-metre-long debris, which appears to be a piece of a wing, was found by employees of an association cleaning the area and handed over to the air transport brigade of the French gendarmerie (BGTA), who have opened an investigation. An air safety expert did not exclude it could be a part of the Malaysia Airlines flight MH370, which went missing in the Indian Ocean on March 8, 2014. AFP PHOTO / YANNICK PITOU (Photo credit should read YANNICK PITOU/AFP/Getty Images)
Police and gendarmes carry a piece of debris from an unidentified aircraft found in the coastal area of Saint-Andre de la Reunion, in the east of the French Indian Ocean island of La Reunion, on July 29, 2015. The two-metre-long debris, which appears to be a piece of a wing, was found by employees of an association cleaning the area and handed over to the air transport brigade of the French gendarmerie (BGTA), who have opened an investigation. An air safety expert did not exclude it could be a part of the Malaysia Airlines flight MH370, which went missing in the Indian Ocean on March 8, 2014. AFP PHOTO / YANNICK PITOU (Photo credit should read YANNICK PITOU/AFP/Getty Images)
ANKARA, TURKEY - JULY 30: Debris found on the island of Reunion east of Madagascar, appears to be part of Malaysia Airlines MH370 that disappeared in 2014. (Photo by Graphic: Ahmet Burak Ozkan/Anadolu Agency/Getty Images)
A policeman and a gendarme stand next to a piece of debris from an unidentified aircraft found in the coastal area of Saint-Andre de la Reunion, in the east of the French Indian Ocean island of La Reunion, on July 29, 2015. The two-metre-long debris, which appears to be a piece of a wing, was found by employees of an association cleaning the area and handed over to the air transport brigade of the French gendarmerie (BGTA), who have opened an investigation. An air safety expert did not exclude it could be a part of the Malaysia Airlines flight MH370, which went missing in the Indian Ocean on March 8, 2014. AFP PHOTO / YANNICK PITOU (Photo credit should read YANNICK PITOU/AFP/Getty Images)
A policeman and a gendarme stand next to a piece of debris from an unidentified aircraft found in the coastal area of Saint-Andre de la Reunion, in the east of the French Indian Ocean island of La Reunion, on July 29, 2015. The two-metre-long debris, which appears to be a piece of a wing, was found by employees of an association cleaning the area and handed over to the air transport brigade of the French gendarmerie (BGTA), who have opened an investigation. An air safety expert did not exclude it could be a part of the Malaysia Airlines flight MH370, which went missing in the Indian Ocean on March 8, 2014. AFP PHOTO / YANNICK PITOU (Photo credit should read YANNICK PITOU/AFP/Getty Images)
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The last communication from the plane was from the Captain Zaharie Ahmad Shah who signed off with “Good night, Malaysian three seven zero”, as the plane left the Malaysian airspace.

A 440-page final report by the Australian Transport Safety Bureau (ATSB) last year showed that Zaharie had flown a route on his home flight simulator six weeks earlier that was "initially similar" to the one actually taken by MH370.

A forensic report by the Malaysian police previously concluded that there were no unusual activities other than game-related flight simulations.

Kok said the investigators examined the history of the pilot and the first officer, and they were satisfied with their background and training and mental health.

"We are not of the opinion it could have been an event committed by the pilots," he said, but added they were not ruling out any possibility since the in-air turn back was done manually and the systems in the plane were also manually turned off.

"We cannot exclude that there was an unlawful interference by a third party," Kok said.

He added all the passengers of the 15 countries had their backgrounds checked by their respective countries and all came back with a clean bill of health.

The next-of-kin of the passengers were briefed on the final report by investigators earlier on Monday.

Voice 370, a group representing the relatives, has previously urged the Malaysian government for a review of the flight, including "any possible falsification or elimination of records related to MH370 and its maintenance."

"We hope that these mistakes will not be repeated and that measures are put in place to prevent them in the future," said Grace Nathan, a lawyer whose mother, Anne Daisy, was on the plane.

"The one point they stressed was that this report was not to assign blame, it was only a safety investigation," she said.

Chinese Foreign Ministry spokesman Geng Shuang said Beijing had paid close attention to the MH370 investigation.

"We hope that all sides can continue to remain in close contact and coordination, to properly carry out relevant follow-up work," he told a daily news briefing, without elaborating.

The only confirmed traces of the aircraft have been three wing fragments washed up along the Indian Ocean coasts.

Malaysia's newly elected Prime Minister Mahathir Mohamad has said Malaysia would consider resuming the search for MH370 only if new clues come to light.

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