From our friends at Destination DC:

The safety of our visitors is our top priority. Between the local and federal government, Washington, DC is uniquely situated as one of the best trained first response communities in the country. Destination DC also works closely with the Mayor of the District of Columbia, the Metropolitan Police Department and other local and federal government agencies to understand and communicate safety messages on behalf of the tourism community.

For more information, please visit: https://washington.org/dc-information/washington-dc-safety-information