Police later determined that no shots were fired and the person who called 911 was mistaken.
Greenwich Police asked the MTA to hold two trains because they were looking for a suspect in a bank robbery.
Alex Paschos of Shelton, Connecticut shot this amazing video of police searching a Metro-North train for the suspect: http://instagram.com/p/dkpSeSypTq/.
A People's United Bank nearby was held up just before 5 p.m. by a man wearing a fedora and a gold color tie. He told the teller in Spanish that he had a gun.
He got away with cash, and ran toward the Metro-North train platform, where a train had just come in.
The trains were searched and moved on with no sign of the suspect.
Train service resumed at 5:45 p.m.
Police continue to search the area for the man who they say may be armed and dangerous.