Metro police have arrested a man who they say was inappropriately touching women on trains after one victim posted an account on a blog.

The rider described her experience on the blog Unsuck DC Metro, saying the man stood behind her twice, rubbing against her and pretending the train was too crowded. The man took the yellow line from L-Enfant to Pentagon and rode the last car, she said. An undercover Metro police officer who read the account decided to pursue the tip.

The woman’s detailed description of the man including his glasses and watch helped officers catch him engaging in the same behavior. The man was arrested Wednesday and charged with assault and battery.

Transit police are asking any other victims to call them at 301-955-5000.