Danish Police said on Wednesday that two Swedish nationals were the main suspects in an explosion at the Danish Tax Agency building in Copenhagen.
A 22-year-old Swedish man was arrested on Wednesday, and police were searching for a second Swedish man, Chief Police Inspector, Jorgen Skov, told newsmen in Copenhagen.
Skov said the 22-year-old was arrested in the southern Swedish city of Malmo and was to be extradited to face a pre-trial detention hearing.
Police have requested a closed-door hearing due to the ongoing investigation.
However, a warrant had been issued for the second suspect, who remained at large.
The Aug. 6, explosion shattered windows and damaged the facade of the building, one passer-by was slightly injured by debris, but the two people inside the building at the time of the blast were not hurt.
According to Skov, a car believed to have been used by the suspects has been seized and is being examined.
Several raids have been conducted in Sweden in connection with the blast.
Meanwhile, the incident has not been linked so far to a second blast that hit a Copenhagen.