Germany probes cause of deadly train crash

German investigators raced Wednesday to determine what caused a train crash that killed 10 people, warning it was too early to draw conclusions as media reports claimed human error was to blame.

Two trains travelling at high speeds crashed head-on Tuesday on a single track in one of Germany's deadliest accidents in years, with one slicing the other apart, ripping a large gash in its side.

All bodies had been recovered from the wreckage, police said, adding that 17 people were severely injured and 63 slightly hurt in the collision near the southern spa town of Bad Aibling.

Transport Minister Alexander Dobrindt said the line was fitted with an automatic braking system that should have prevented such accidents and investigators were probing whether the mechanism malfunctioned or whether there had been human error.

Newspaper group RedaktionsNetzwerk Deutschand (RND), citing sources close to the investigation, said a signalling station worker had manually deactivated the automatic signalling system to let the first train -- which was running late -- go past.

That action would have also shut off the automatic braking system.

The second train then forged ahead on the same track in the opposite direction, before the first was able to split off where the line divides into two, according to RND.

The influential daily Sueddeutsche Zeitung also said preliminary investigations showed that the safety system had been manually switched off by a signalling controller who only realised he had made a colossal mistake when it was too late. 

Police would not confirm the reports, and a spokeswoman from the transport ministry would also not be drawn.

"All possibilities that could have led to this disaster are being examined. That includes examining the black boxes, looking at what happened on the tracks, speaking with witnesses and signalling workers," said spokeswoman Vera Moosmayer.

"There are no findings yet. The investigations are ongoing."