Two men in their 20s have been arrested and have now been arrested.
They are suspected of preparing for general destruction and serious violations of the law on flammable and explosive goods, the police write on their website.
The operation was carried out at 22 o'clock.
When the objects were found, the national bomb squad was called in to take care of the potentially dangerous bombs.
The objects have now been seized and sent to the National Forensic Center (NFC) for investigation into how dangerous they are and what damage they could have done if they had detonated.
The two men will be questioned, with defense counsel, on Friday.
The crackdown is part of the police's work against serious organized crime in the Stockholm area.
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See the devastation after an explosive charge in an apartment in Husby, one of all the explosions of recent years.
Photo: TT