A driver may have deliberately crashed his box truck into security barriers at Lafayette Square across from the White House last evening, according to the Secret Service.
Update: The driver of the truck that crashed into security barriers near the White House last night has been arrested on multiple charges and a Nazi flag was found. https://www.nbcnews.com/news/us-news/truck-crashes-security-barriers-white-house-driver-detained-nazi-flag-rcna85718
Truck crashes into security barriers near White House; driver arrested

A driver was arrested and a Nazi flag was seized from the scene after a truck crashed into security barriers near the White House on Monday night, officials said.

NBC News
@w7voa It has the feel of a “reconnaissance in force” mission wherein one try’s to draw out the enemy’s defenses. The guy driving probably didn’t know much. Observers would gauge reaction times, directions, etc. This suggests a higher level of threat to the White House and nearby buildings.