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Officials have reportedly ordered a shelter-in-place at the U.S. Capitol due to reports of “a potential security threat” that some on Twitter have indicated were gunshots. A public information officer for the U.S. Capitol Police could not immediately be reached for comment.

Update 3:12 p.m.: The Associated Press reports that a shooter has been apprehended with at least one officer “not seriously” injured:

The shelter-in-place remains:

Update 3:35 p.m.: The Metropolitan Police Department says there is “no active threat to the public”:

Update 3:53 p.m.: Officials have lifted the shelter-in-place but the Capitol Visitor Center remains closed: