Surveillance video has captured the moment of the explosion in an attempted terrorist attack at Port Authority Bus Terminal in New York City.

Commuters scrambled to evacuate the major transit hub just blocks from Times Square after a man detonated a small explosive device in the city's subway system.

Police said a suspect was in custody with non-life threatening injuries.

Governor Andrew Cuomo has told CNN that the suspect in the attack was “disgruntled” and “went to the internet to try and get information about how to make a home-made bomb”.