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Three brothers have been arrested for the bombing of the U.S. Embassy in Norway, an attack in which no one was injured. 

The brothers were taken into custody in Oslo and are Norwegian citizens of Iraqi origin in their 20s, authorities said Wednesday, Reuters reported. 

"They are suspected of a terror bombing," Police Attorney Christian Hatlo told reporters.

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A police investigator at the U.S. Embassy in Oslo.

Forensic investigators work on Wednesday at the scene in connection with the arrest of three brothers after the explosion at the U.S. Embassy on Sunday in Oslo. (Stian Lysberg Solum/NTB via AP)

"We believe they detonated a powerful bomb at the U.S. embassy with the intention of taking lives or causing significant damage," he added. 

The bomb, an improvised explosive device (IED), went off Sunday and damaged the entrance to the embassy's consular section. 

Investigators were still trying to determine a motive for that attack, one of which would be an act of terrorism, authorities said. 

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Police Attorney Christian Hatlo

Police Attorney Christian Hatlo speaks during a press briefing at the police station about new developments in the investigation into the explosion at the US embassy in Oslo, Norway, Wednesday, March 11, 2026.  (Lise Aserud/NTB Scanpix via AP)

"We believe they detonated a powerful bomb at the US embassy with the intention of taking lives or causing significant damage," Hatlo said.

Authorities believe one of the men planted the bomb while the two others took part in the plot, Hatlo said. 

Police have reinforced security measures and have increased their presence around the embassy. 

A damaged door at the U.S. Embassy in Norway.

A view of a shattered door, at the U.S. Embassy in Oslo. (Fredrik Varfjell /NTB Scanpix via AP)

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