MOSCOW – Russia protested to the United States on Wednesday after it said Russian flags were stolen from its consulate in San Francisco.

U.S. officials have since occupied administrative parts of the compound. Russia said last week they had broken into residential areas and it threatened retaliation over what it called an illegal act.

“The latest shameful event. In San Francisco (Russian) flags have been stolen from the building of @ConsulRussiaSF,” the Russian embassy to the United States said on its Russian-language Twitter account.

“We demand the American authorities return our state symbols,” it said alongside pictures of a bare flagpole on top of the consulate building.

The Russian embassy and U.S. State Department were not immediately available for comment.

Russian news agencies cited the Russian embassy as saying it had lodged a formal protest over the incident.

“A strong protest was sent to the American side in relation to Russian flags being torn down at our diplomatic properties in San Francisco, which are under the control of U.S. authorities,” Interfax news agency quoted the embassy as saying in a statement.

“We consider this as an extremely unfriendly step,” the embassy said.