According to WashCycle there are some attacks happening on the Custis Trail:
SEXUAL BATTERY 12/04/10, 2800 block of N. 11th Street. On December 4 at 2 am, a woman was walking when an unknown male rode past her on a bicycle and grabbed her buttocks. After the woman walked further, the same suspect rode by her again, and assaulted her a second time. The suspect was wearing a dark knit cap and a dark jacket. He also had long dark hair.
SEXUAL BATTERY 12/04/10, 4400 block of N. 15th Street. On December 4 at 4:45 pm, a woman was running on a bike trail when an unknown subject rode up behind her on a bicycle and grabbed her buttocks. The suspect was an Asian or Hispanic teenage male, 5’7” and 140 lbs. He was wearing a black puffy jacket, jeans, brown boots, and carried a green backpack.