TRAIN CHAOS Panic at Union Square after ‘unknown substance’ causes passengers to cough and vomit and cops shut down station

AN unknown substance that was released on a subway platform caused several straphangers to vomit and cough uncontrollably. The terrifying incident unfolded inside Manhattan's 14 Street-Union Square subway station just after 10am on Friday.-- More... Union Square Station EVACUATED after an unspecified incident where passengers were sprayed with chemicals, possibly pepper spray