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Munich killer Ali David Sonboly went on a weapons training holiday to Iran with his father before embarking on his killing spree, it is claimed today.

A fortnight after unblanced Sonboly, 18, lured young people to a McDonald's restaurant in Munich and killed nine of them before taking his own life it has emerged that the German-Iranian youth travelled with his father Masoud to Iran in December last year.

The news magazine Focus said that he underwent "weapons training" while there which included firing guns, although it was not specified where.

Sonboly, who was obsessed by violent computer games and mass school shootings in both Germany and America, bought a 9mm Glock handgun from the 'dark web' for £80 to commit the murders.

(Image: Roland Leon)

The Munich prosecutor's office refused to comment on the report saying: "We cannot make any comment on this aspect of the case due to the ongoing enquiry."

His father Masoud did not mention the Iranian trip, or gun firing while there, in an interview last weekend with the Bild am Sonntag newspaper.

He said that he and his wife and 14-year-old son had faced numerous death threats since his son's rampage on July 22.

He also told the newspaper he had no idea that his son was planning such an act.

(Image: Getty)

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Sonboly, who also left 27 others injured, was obsessed with Adolf Hitler and expressed shocking racist views, German investigators say.

The killer reportedly saw it as an 'honour' that he had the same birthday as the Nazi leader - April 20.

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(Image: Universal)

He told his loved ones he was proud to be a German-Iranian 'Aryan' - and made clear his hatred of Turks and Arabs, according to local media.

He apparently felt 'superior' to those of either origin.

Now, investigators are looking at the possibility that Sonboly, whose parents are Iranian, deliberately targeted foreigners during his deadly shooting spree.