Investigators are searching for a man in his late teens who assaulted a woman walking on the Metropolitan Branch Trail in Northeast Washington around noon Monday, and police say they believe the attack was sexually motivated.

The incident was the most recent assault on the bicycle trail, which has been beset by sporadic assaults in recent years. Last late October, a charter-school teacher walking on the trail in Northeast was beaten and robbed by a large group of assailants. Police say the 50-year-old man was taken to a hospital with severe injuries.

And in June 2013, a bicyclist in his 30s was severely beaten by as many as 15 youths on the trail, which runs through the District from Union Station to Silver Spring.

The incident Monday happened in the 1800 block of 4th Street NE. Police are classifying the offense as Assault with Intent to Commit First Degree Sexual Abuse.

The attack was unsuccessful, and the suspect fled on a dark-colored bicycle.

Authorities described the suspect as black with a medium complexion, about 18 years old, and about 5-feet-5, with a medium build. He was described as having short hair and slight facial hair on his chin. He was wearing a white tank top and khaki cargo shorts or rolled-up pants.

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