More than half a dozen subway lines were re-routed or delayed due to signal problems in Manhattan, causing extensive delays during the evening rush.
The A, C, E; the B, D, F; and the G trains all ran with delays in both directions because of signal problems between World Trade Center and Chambers Street.
The MTA said a power failure at the World Trade Center station caused the subway stoppage just after 4 p.m.
Service eventually resumed but with extensive delays.
A shooting at the Borough Hall subway station also had the 4 and 5 trains bypassing that station during the evening.