Tri-acetone tri-peroxide (TATP) was seized from a German man in his twenties at Gothenburg's Landvetter airport, according to Swedish daily Göteborgs-Posten and Swedish tabloid Aftonbladet.
The man was arrested yesterday after the substance was detected during routine security checks. Large sections of the airport were cordoned off while the material was investigated and subsequently removed.
Göteborgs-Posten and Aftonbladet report that the man is believed to have been carrying cans of TATP in his luggage, a substance used in several major terrorist attacks across Europe in recent years.
The man has denied any wrong-doing, but has been detained on suspicion of attempted terrorism.