The news is showing smoke coming from the West 4th Street station on Sixth Avenue, and NY1 says that a storage room may be on fire. Which means there's no B, D, F, or V service between 34th Street and Broadway-Lafayette; NY1 says the F is moving on the A line between Jay Street and 42nd Street, which means the A, C, and E still seems okay (updated: So A, C, and E service is messy...). Gothamist hopes it's only a storage room on fire - not a room where switches and signals are, because the last time that happened, subway service was screwed for a few months (though not years).
Were you underground at the time? How did the MTA handle things?
Photograph from WNBC