Police secure Eighth Avenue outside the Port Authority Bus Terminal following an explosion near New York's Times Square on Monday, Dec. 11, 2017. (AP Photo/Chuck Zoeller)
Police stand guard in front of the Port Authority Bus Terminal near New York's Times Square following an explosion on Monday, Dec. 11, 2017. (AP Photo/Andres Kudacki)
Police block a street by Port Authority Bus Terminal near New York's Times Square following an explosion on Monday, Dec. 11, 2017. (AP Photo/Andres Kudacki)
A police officer stands guard in front of Port Authority Bus Terminal as law enforcement respond to a report of an explosion near Times Square on Monday, Dec 11, 2017, in New York. (AP Photo/Andres Kudacki)
Police block off a sidewalk while responding to a report of an explosion near Times Square on Monday, Dec. 11, 2017, in New York. (AP Photo/Mark Lennihan)
Photos from the scene of a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City. (Amborjo via Instagram)
This is Penn Station following a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City. (Brooke DiPalma via Twitter)
Photos from the scene of a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City. (Exposed Magazine via Twitter)
Photos from the scene of a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City. (FDNY via Twitter)
Photos from the scene of a pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City. (Bill Sweet via Twitter)
MIDTOWN, Manhattan (WABC) -- Photos from the scene of a possible pipe bomb explosion at the Port Authority Bus Terminal in Manhattan, New York City.