The intelligence community is rightly concerned about retaliatory attacks in the wake of Osama bin Laden's death. It's something that the DC United front office is looking at ahead of their Wednesday evening game against the Seattle Sounders. Also, DC Metro is increasing security on public transit in the city.
Major League Soccer recently released a statement that they are working with local officials and teams regarding increased security for games. Hopefully they have everything squared away before the DC game. Even so...be on alert if you're traveling this week.