[UPDATE BELOW] 42nd Street is currently closed to traffic between 7th and 9th Avenues as the FDNY investigates a "foul odor" that has landed four people in the hospital and prompted the evacuation of a building at 330 West 42nd Street. The FDNY tells us the four were taken to Bellevue, and that 100 people have been evacuated from the 4th floor of the building, which happens to be the McGraw-Hill Building, right by Port Authority. The FDNY is investigating the source of the foul odor, but if you've ever had to use the men's room at Port Authority, you know it shouldn't be too hard to track down the source.

One employee tells Animal New York that the fumes are from an adjacent construction site, and have been "smelling all week." It's unclear whether the entire building was evacuated or the fourth floor, but another FDNY spokesman tells DNAinfo, "Some people say it's paint fumes, some say it's gas fumes. Right now, we don't know what it is." We'll update as more information becomes available.

UPDATE 12:40 p.m.: Manhattan Community Board 4's office is also located at 330 West 42nd Street. One tipster emails us to say, "I'm presently a board member and we received notice that the entire building had to be evacuated, or at least up to the 26th floor."

ABC 7 reports that "around noontime, the odor began dissipating and people were allowed to return."