Police say the item, which was found on the platform at the 86th Street subway station just before 1:30 p.m., may have belonged to a homeless person, as some other apparent possessions were found nearby.
The NYPD Bomb Squad and K9 investigated, prompting some "severe" service disruptions on multiple train lines.
Nos. 1, 2 and 3 trains have resumed making scheduled stops in both directions, but are running with severe delays in both directions.
The MTA is recommending the following alternatives while they work to get trains back on schedule:
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