darcy spencer is at the station now to explain what happened next. darcy? >> reporter: jim, as you can imagine, this woman is still very shaken up, but she was able to provide a very detailed description of this suspect who metro, as well as to a very popular website, which posted that information and that's what led to his arrest. >> reporter: metro transit police have arrested a man accused of groping women on subway cars. the arrest came after a victim posted his description all the way down to his ralph lauren glasses on a popular blog called, unsuck dc metro.blog spot.com. >> i think that it's disgusting and i i'm glad he got caught. >> reporter: the victim named alley called police was rubbing against himself against young women on the train. she posted as he gets on the train at the metro, and gets off at the pentagon, always riding in the last train car. she posted the man's description including that he wears track suits, a white watch, and the glasses with heavy black frames. a metro transit investigator apparently mon, to the site saw the posting