State Police are investigating a gas station robbery in Bridgewater.  Troopers responded to the Mobil on New Milford Road West shortly after 10:30pm Saturday.  The store at the gas station has been forcibly entered.  No merchandise was taken.  No cash is kept overnight, so Troopers say no money was stolen either.  State Police recovered the suspect vehicle at the scene, but provided no further details.  The incident is pending further investigation.