BROOKLYN - The NYPD says a man groped a woman on the southbound N train on Aug.5.

Police say the woman got on the train at the 14th St. Union Square station.

They say when the train reached the Eighth Ave. station the suspect grabbed the victim's ankle and slid his hand up to her knee before running off.

Police describe the suspect as approximately 20 years old and around 5 feet 6 inches tall.