The issues began around 5:30 p.m., when the MTA said signal problems prompted them to suspend the entire line -- between 34th Street/Hudson Yards and Flushing/Main Street in Queens.
Even though service started up again just before 7 p.m., the MTA said there are extensive delays, and riders are urged to take alternative subway or bus lines.
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The shutdown likely impacts many New York Mets fans going to Wednesday's game against the Phillies, which starts at 7:10 p.m.
Here's a look at the large crowd at Queensboro Plaza in Long Island City during the suspension:
This video from NewsCopter 7 showed the view from above the same station:
Riders took to social media to talk about the suspension of service:
Some people said they were even stuck on a train:
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This is a breaking news story. Keep checking abc7NY for the latest on this developing story.