Several people were injured Monday morning when a device exploded at the Port Authority bus terminal on 42nd Street, according to law enforcement sources.
One person is in custody after his device partially detonated inside a tunnel, sources told The Post.
Police and firefighters have responded to the scene, where the bomb squad also has been deployed.
The NYC Office of Emergency Management said commuters should expect delays.
There was no immediate word on what prompted the response between Eighth and Ninth avenues.
This a developing story.