Norwegian police are investigating an apparent explosion at the U.S. Embassy in Oslo that caused no injuries and only minor damage.

Amid the war on Iran, Norwegian Justice Minister Astri Aas-Hansen is deploying “considerable resources” to search for potential multiple perpetrators.

“This is an unacceptable incident that we are taking very seriously,” she told Norwegian press agency NTB.

A “loud bang” was reported at the U.S. Embassy in Oslo at 1 a.m. Sunday local time (Saturday 7 p.m. ET), according to police, and eyewitnesses told Reuters that they saw thick smoke by the entrance of the consular section.

“There was a very thick layer of smoke on the street,” said Sebastian Toerstad, 18, a high school student who drove past the embassy at the time of the explosion.

“There was some damage to the entrance.”

No explosive devices had been found in the area, according to police.

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“Investigations have been carried out at the scene with the aid of dogs, drones and a helicopter, searching for one or more potential perpetrators,” the Oslo police department said in a statement.

PST, the Norwegian police security service, called in additional personnel following the incident but has not changed the country’s terror threat level, according to communication advisor Martin Bernsen.

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PST operations manager Mikael Dellemyr does not “connect” the attack to U.S. bombings in the Middle East or terrorist or Iranian retaliation.

“It is far too early” in the investigation, he told Oslo’s TV 2.

Fox News Digital reached out to the State Department for comment, but they did not immediately respond.

The Associated Press and Reuters contributed to this report.

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