According to The Guardian, Washington police say that no arrests were made at the Women's March today.
Another tweet from Carl Schreck which seems to confirm that the march has happened despite earlier reports that the streets were too packed for it to go ahead. (The BBC says it was rerouted though)
More from RFE/RL's Carl Schreck, who was at the march in Washington today:
The man who inspired today's events, Donald Trump, visited CIA headquarters at Langley today. He appeared to make no mention of the Women's March in Washington, but the Associated Press reports that he accused the media of lying about the number of people at his inauguration yesterday and said that the crowd reached the Washington monument (which is not correct according to AP).
Here's some video footage of Madonna's appearance at the Washington march (Graphic language):