Dutch experts say Malaysia Airlines flight MH17 broke up in mid-air after being hit by "objects" that "pierced the plane at high velocity" in July.

The new report also said there was "no evidence of technical or human error".

Correspondents say this matches claims that MH17 was hit by missile shrapnel.

Investigators relied on cockpit data, air traffic control and images, as the crash site in eastern Ukraine remains too dangerous to access amid fighting between government troops and rebels.

The plane was flying from Amsterdam to Kuala Lumpur when it crashed in rebel-held territory in eastern Ukraine.

All 298 people on board, most of them from the Netherlands, died when the plane came down, amid reports it was shot down by pro-Russian rebels.

Tjibbe Joustra, chairman of the Dutch Safety Board, which is conducting the investigation, said a final report would take around a year to publish.

"We're trying to make the report for the next-of-kin - very important - but also for history," Mr Joustra said.

The crash site was in rebel-held territory in eastern Ukraine, making the investigation even more difficult

Analysis: Richard Westcott, Transport correspondent

This report doesn't say flight MH17 was knocked from the sky by a missile. But it pretty much rules out anything else.

There were no emergencies on board, no mechanical problems, the pilots didn't make any mistakes.

Instead, it talks about the plane being punctured by "high-velocity objects", which is consistent with how the BUK missile system works (that's the system many suspect was responsible). They don't actually hit the target, they explode nearby and pepper it with shrapnel for maximum damage.

But all of this doesn't answer the critical question. Who fired the missile?

Both sides in this conflict use the same weapon. To find out who made this terrible mistake, they need to determine where on the ground the missile was actually launched from. And one expert told me that they should eventually be able to work that out with a combination of radar data and evidence from the scene.

There is one very sobering fact also highlighted in this report. Three other, very large commercial airliners flew over the same area at around the same time.

First findings of MH17 crash report

Russians 'operated BUK' in MH17 area

The Dutch team analysed photographs of the wreckage that showed a number of pieces with multiple holes

They said the plane "broke up in the air probably as the result of structural damage caused by a large number of high-velocity objects that penetrated the aircraft from outside."

The cockpit voice recorder revealed no signs of any technical faults or an emergency situation, the experts said.

The investigators have not visited the crash site because of fighting in the area but they said photographic evidence of the wreckage suggests the plane split into pieces during "an in-flight break up".

Maintenance history showed the aircraft was airworthy and had no known technical problems when it took off from Amsterdam, the report added.

Experts said it was manned by "a qualified and experienced crew" and that engines were running normally at 293 knots at 33,000ft (cruise altitude).

Radio communications between the pilot and Ukrainian air traffic control confirm that no emergency call was made.

Final transmissions from MH17

At 13:08:00 MH17 contacts Ukraine's Dnipropetrovsk International Airport (DNP):

MH17 to DNP: Dnipro Radar, Malaysian one seven, flight level 330

DNP to MH17: Malaysian one seven, Dnipro Radar, good day, radar contact

Flight MH17's last transmission was at 13:19:56 when it responded to a navigation request from DNP:

DNP to MH17: Malaysian one seven, due traffic proceed direct to point Romeo November Delta

MH17 to DNP: Romeo November Delta, Malaysian one seven

At 13:20:00, DNP sends MH17 another radar message but there is no response:

DNP to MH17: Malaysian one seven, how do you read me? Malaysian one seven, Dnipro Radar

DNP makes two more requests for contact from MH17 before Russia's Rostov airport (RST) calls in at 13:22:05.

RST to DNP: Listening [to] you, its Rostov

DNP to RST: Rostov, do you observe the Malaysian by... by the response?

RST to DNP: No, it seems that its target started falling apart.

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