NEW YORK -- Four people were injured in an explosion in a passageway near Times Square, Manhattan in New York City early Monday morning.

At around 7:20 am local time, a 27-year-old man, who had an improvised, low-tech explosive device attached to his body, intentionally detonated the device, injuring himself and three others, New York City Police Commissioner James O'Neil said at a press conference held near the scene.

O'Neil said police have identified the suspect as Akayed Ullah and have kept him in custody. He gave no further details about the suspect.

He added that the incident was captured on transit system video. A further review and witness interview is underway.

Police are calling for the general public to provide information about the suspect.

Authorities said three injured people had minor injuries such as ringing in the ear and headache.