By Robert Wall and Andy Pasztor 

Air accident investigators probing the downing of Malaysia Airlines Flight 17 over eastern Ukraine published their first definitive account of the accident--drawing from analysis of the plane's onboard cockpit and data recorders and other external sources--but coming to no new conclusions other than definitively stating the plane was shot down.

Investigators said high-energy objects struck the Boeing 777 and caused the plane to break apart midflight, consistent with the now-widely held view the plane was brought down by a sophisticated antiaircraft weapon, which would have detonated near the plane, showering it with shrapnel at close range.

The preliminary accident report published Tuesday notes that investigators found no technical faults and no sign the pilots sent a distress call. What is still unknown--and what aircraft accident investigators won't be able to clear up--is who fired the missile: Russian backed militants operating in the area, as Ukraine alleges, or Ukraine's own military, as Russia charges.

Separate from the air accident investigation, Dutch officials also have opened a criminal investigation into the apparent shootdown of Flight 17, which had 193 Dutch citizens aboard when it went down. Dutch prosecutors are gathering evidence and hope to file criminal charges about who fired the missile in Dutch courts. Moreover, Dutch plaintiffs' lawyers separately plan to file civil suits on behalf of the relatives of the 298 people killed once further evidence is released.

Air accident investigators issued their report with almost no access to the crash site, which is highly unusual for a crash on land, and said they relied on photographs rather than recovered wreckage in reaching their preliminary findings. Rebels in the area--and heavy fighting--have kept most investigators away from the site.

However, investigators did take possession of the plane's black boxes and were able to analyze a host of external data, including radio communication, radar and other flight data.

"The initial results of the investigation point towards an external cause of the MH17 crash," said Tjibbe Joustra, chairman of the Dutch Safety Board, which published the interim report on the crash.

The 34-page report is the first official publication on the cause of the incident. The Dutch group is leading the probe that also involves representatives from the U.S., U.K. and International Civil Aviation Organization.

There is no evidence of a technical fault, the report said. The plane's pilots issued no distress call, according to investigators, and their last communication with air-traffic controls, involving routine acknowledgment of a route change, occurred about seven seconds before the onboard recorders stopped working.

The Boeing 777 was brought down on July 17 while flying at 33,000 feet from Amsterdam to Kuala Lumpur killing all 298 people onboard. The U.S. and Ukraine accuse Russian separatist rebels of shooting down the plane with a sophisticated antiaircraft missile. Russia denies its allies were involved.

The report says three other jetliners flew over the same general airspace around the time Flight 17 went down, but those crews weren't able to provide investigators with any relevant information.

Details of air-traffic control transmissions reveal that personnel at a Ukraine radar facility tried in vain for some 16 minutes to contact Flight 17. Russian controllers had expected the plane to contact them via radio just as its crew stopped communicating. Checking radar images, a Russian controller told a Ukrainian counterpart: "It seems that its target started falling apart." Then the Russian controller reiterated, "we see nothing."

Oleg Storchevoi, deputy head of Rosaviatsia, Russia's air-safety regulator, told state television Tuesday that investigators would need to do more work to ascertain the cause of the crash and complained that the probe had lost valuable time.

The report "is preliminary and is just the beginning of a long, painstaking process," he said, adding that further investigation of the crash site and wreckage, among other materials, would be vital. "Without this information, it's impossible to talk even about relatively preliminary conclusions about the cause of the accident," Mr. Storchevoi said.

Separatist leaders reiterated Tuesday their denials of any involvement in the crash, saying the report confirmed their claims that the plane was downed by Kiev's forces in an effort to discredit the rebels and their supporters in Russia.

However, reports by Russian state media that a Ukrainian combat plane was in the area and could have shot down Flight 17 weren't supported by the safety investigators, with radar data showing there were only a few other airlines in the area at the time.

The downing escalated western efforts to impose sanctions on Russia for its involvement in Ukraine. Russia has imposed retaliatory sanctions and said it may bar western airlines for using its airspace on heavily trafficked flights to Asia.

Accident investigators have said they would not seek to establish culpability. Malaysian Prime Minister Najib Razak on Saturday said intelligence reports on the downing of the plane are "pretty conclusive."

The Dutch-led group said the jetliner was "pierced in numerous" places. "The pattern of damage to the aircraft fuselage and the cockpit is consistent with that which may be expected from a large number of high-energy objects that penetrated the aircraft from outside," the Dutch Safety Board said. The findings are consistent with a missile strike. A missile warhead creates shrapnel to destroy its target.

The objects that struck the plane are likely to have led to a loss of structural integrity of the Boeing 777 and an in-flight break up, the board said. "This also explains the abrupt end to the data registration on the recorders, the simultaneous loss of contact with air traffic control and the aircraft's disappearance from radar," it said in the report.

Ukrainians have alleged that only a trained unit could operate the kind of sophisticated missile system capable of shooting down the jet and argue Russian soldiers must have provided training to rebels. The Ukrainians claim that a three-vehicle convoy including the missile system and related equipment left Ukraine across the border to Russia shortly after the shoot down.

Investigators said they found remnants of the cockpit and front section of the fuselage in the area closest to the last recorded position of the jet, suggesting those portions may have been severed from the rest of the plane.

Before it was hit, the jet was flying at cruise power and "all indications regarding the operation of the engines were normal," according to the report.

The final report is due to be published within a year of the accident, the Dutch Safety Board said, adding it expected more evidence to become available.

An interim report is typically issued a month after a plane crashes, but the Flight 17 report was delayed because investigators were unable to reach the crash site amid fighting between Ukrainian government troops and the pro-Russian separatists. Ukraine has said Russian troops also are involved in the fighting, a charge Moscow denies.

The crash report draws on information gleaned from the so called black boxes, which record conversations in the cockpit and store data on the aircraft's systems. Britain's Air Accident Investigations Branch extracted the information from the units that were damaged in the crash but still contained useful information. The devices, that were in the hands of the rebels for days before being turned over, weren't tampered with, the Dutch Safety Board said.

There were no indications of aural alerts on the cockpit voice recorder, the board said, and the flight data recorder also didn't indicate anything was wrong with the plane. Both recording devices cut off at the same time indicating power was cut instantaneously.

The safety experts, who were recalled from Ukraine last month amid problems reaching the crash site, also have been examining video and photographic material for clues. Most of the analysis has been conducted in The Hague.

Accident investigators said the final report would also explore why Flight 17 was cleared to fly through airspace where days earlier a military transport plane flying at lower altitude was shot down. Ukraine had imposed a limited flight ban in the wake of the downing of the military plane, though the Malaysia Airlines jet traveled at an altitude declared safe and in airspace used by other carriers.

The downing of Flight 17 has heightened concerns among airlines about where they fly. Most airlines have stopped operating over Syria and Iraq amid worries that clashes on the ground could threaten flights.

Margaret Coker and Gregory L. White contributed to this article.

Write to Robert Wall at robert.wall@wsj.com and Andy Pasztor at andy.pasztor@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

Boeing (NYSE:BA)
Historical Stock Chart
From Mar 2024 to Apr 2024 Click Here for more Boeing Charts.
Boeing (NYSE:BA)
Historical Stock Chart
From Apr 2023 to Apr 2024 Click Here for more Boeing Charts.