Officer Jack Collins arrested 27-year-old Akayad Ullah at gunpoint with the assistance of three other PAPD officers: Sean Gallagher, Anthony Manfredini and Drew Preston.
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They rushed in moments after the blast at 7:20 a.m., which sent people running during the morning rush.
But Collins and other officers ran toward the scene to take down the person allegedly behind the explosion.
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Collins was working his usual beat of looking for kids being trafficked at the Port Authority Bus Terminal on 42nd Street when the incident occurred.
A photo from the Port Authority Police Department shows Collins in action during a normal day at work: