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The blast which was described by witnesses as "powerful" occurred on Brännkyrkagatan street at 11:40 am local time, Aftonbladet newspaper reports.

Windows were shattered in a nearby house, however, the apartment's owner told Expressen.se this is unrelated to the blast.

It is not yet clear whether there are any casualties. "It isn't clear what happened," Stockholm police official Albin Näverberg told Aftonbladet.

He told local media that police are looking into the causes and suggested that there could have been a gas leak. "There was a small blast in the south part of the center, no one was hurt. They suspect [it was] a gas leak," said RT's stringer in the Swedish capital.

Stockholm police have contacted the owner of the apartment where the blast happened. "There are no signs of a crime," the local police department said on its website.

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