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The White House was locked down Monday morning after a driver crashed into a historical marker in Lafayette Park and a man jumped over a White House barricade in a different location at about the same time, authorities say.

Both men were arrested, and the motives in each case remain unclear. While the incidents each occurred at about 10 a.m., authorities believe they are unconnected.

Video shot by Martin Austermuhle of The Washington Sun shows a smoking silver sedan on a brick walkway just north of the White House.

Secret Service officers appear to talk with the driver as National Guard troops stand by.

“Get on the ground!” someone is heard shouting as the driver clashes with officers.

“The driver was combative with law enforcement but was quickly placed under arrest,” the Secret Service said in a statement.

It wasn’t immediately clear why the driver crashed.

The D.C. police department’s bomb squad searched the car as a precaution and determined it was safe.

Secret Service agents ordered journalists to stay in the briefing room in the West Wing.

“Around the same time, a second individual jumped a barricade near the northwest corner of Lafayette Park. That individual was also quickly placed under arrest,” the Secret Service said.

The man hopped over a temporary fence at Pennsylvania Avenue and 17th Street NW. He was arrested and also taken to a hospital.

The White House was locked down for about 30 minutes before normal operations resumed.

The driver was charged with assault with a dangerous weapon, related to the vehicle, and assault on a police officer, a source familiar with the matter said. The man who jumped over the barricade was charged with unlawful entry, the source said.

Shortly before 4 p.m., several Secret Service vehicles headed to Lafayette Park with lights and sirens on. About 12 officers jumped out with their hands on their guns. It wasn’t immediately clear why.

Stay with NBC Washington for more details on this developing story.

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