EDISON - Authorities in Union County say an online predator posed as a Facebook friend, then sexually assaulted a 14-year-old girl. Authorities say the girl thought she was talking to a 17-year-old. It turns out he was 28.

The Union County Prosecutor's Office says 28-year-old Michael Sebastian of Perth Amboy pretended to be a teenager himself and quickly turned their conversation to sex.

After repeatedly rejecting his suggestions to meet up, authorities say the same site Sebastian used to connect to the 14-year-old provided him a way to find her.

Authorites say the girl used Facebook to post about a store in Springfield where she planned to go shopping. Sebastian allegedly used that information to track her down.

Outside the store, Sebastian allegedly convinced the girl to get in his car - where the prosecutor says he sexually assaulted her.

Authorities say the victim's parents did check on her, but not in time to prevent the attack.