District officials advise using Metro instead of trying to drive around the city this Fourth of July.
When special forces raided Osama bin Laden's compound in Pakistan, they found documents stating al-Qaida had considered attacking the United States on Independence Day.
To ward off any potential threats, Park Police Chief Teresa Chambers says all of her officers will be on duty, but she say much of the increased security will be invisible to Independence Day revelers.
"The greatest amount of security is that which you will not see. A combination of technology and plain clothes officers and lots of enhanced ways to improve safety is probably the most robust plan that I've ever seen. I'm very proud of our team," she says.
Chambers also says if you notice anything out of the ordinary, just pass it on to an officer.