Suspect in NYC Port Authority explosion identified as 27-year-old Akayed Ullah

According to NYPD Commissioner James O'Neill, Monday's explosion at the Port Authority Bus Terminal was a "terror-related incident," and details about the alleged perpetrator have begun to pile up since his arrest.

The explosion occurred below ground near 42nd Street and Eighth Avenue in Manhattan.

At least four people — including the suspect — were injured in the incident.

What do we know about the suspect so far?

Law enforcement officials identified the suspect, 27-year-old Akayed Ullah, as the one responsible for the incident. Ullah lives in Brooklyn and is of Bangladeshi descent. A Bangladesh police chief reportedly said that Ullah is a U.S. citizen and has no criminal record in Bangladesh.

According to CNN, Ullah is a former for-hire vehicle driver.

O'Neill reported that Ullah wore an "improvised low-tech explosive device," which was attached to his body. The device was reportedly secured to Ullah's body with velcro straps and zip ties.

According to KNXV-TV, Ullah told authorities that he made the explosive device himself, and had done so at his workplace.

When reporters asked O'Neill during a news conference if Ullah had any ties to the Islamic State, O'Neill said that Ullah "did make statements," but declined to elaborate at the time.

Former NYPD Commissioner Bill Bratton told MSNBC that the attack was ISIS-inspired, and the New York Daily News reported that Ullah told authorities that he attempted to execute the attack in retaliation for recent Israeli actions in Gaza.

Bratton said that Ullah "was supposedly setting the device off in the name of ISIS."

Ullah suffered lacerations and burns as a result of the detonation of the device.

#HappeningNow: @NYCMayor, @NYPDONeill, @FDNY, @NewYorkFBI and @NYGovCuomo update New Yorkers on explosion at #PortAuthority https://t.co/YahqkiviX1

— NYPD NEWS (@NYPDnews) December 11, 2017

This is a developing story and may be updated.