A regular security check flagged up signs of explosive material in his luggage which was being tested, Adlersson added.
Local newspaper Goteborgs-Posten said the man was a German citizen and, citing an unidentified source, that his luggage contained the explosive TATP.
TATP, short for triacetone triperoxide, was used in the blast that killed 22 people outside a pop concert in the English city of Manchester in May.
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