New Delhi, July 29 -- Several key New York City subway lines were suspended or severely delayed on Tuesday morning following a power outage at a major Manhattan signal hub, causing commuter chaos amid an intense heat wave.

According to the MTA, the issue began shortly before 8:30 a.m. at the West 4th Street-Washington Square station, where a power failure hit the signaling system. While trains retained onboard power and air conditioning, service on multiple lines came to a halt or was rerouted.

No B and C Trains: Service is suspended in both directions.

A Train: Suspended between 59 St-Columbus Circle and Jay St-MetroTech.

D Train: No service between Atlantic Avenue-Barclays Center and 34 St-Herald Square.

F Train: Completely suspend...