Saw this on Craig's list.
Solo female cyclist riding south towards trailhead (after mile marker 10.0, approx. 200 yds from the Washington Canoe Club on Water St.), physically assaulted by male pedestrian (black male, approx. 30 y.o., 5'9"-5"10, 150-160 lbs.) who walked onto path from right. Cyclist swerved left to avoid pedestrian but he jumped towards her, hit and punched her and stole the bicycle.
If she were carrying a gun, she wouldn't have been at such a disadvantage. And no, this didn't happen in a dangerous part of DC but rather in what may be the safest and most orderly few blocks of an otherwise lawless city.