UPDATE: The condition of a person previously listed as critical following the crash has been downgraded to serious, and their injuries are not considered to be life-threatening.

A crash that injured 20 people - including one critically - was possibly caused by a driver who was trying to park, but instead accelerated and slammed through a wall at an Atlantic County social security office Tuesday.

The wreck, which occurred shortly before 10 a.m. at the Doughty Road office in Egg Harbor Township, appeared to be an accident, police said.

In addition to the critically injured person, another was listed in serious condition while 18 others suffered minor injuries, according to police. The injured were either struck by the car or hit by debris.

The 56-year-old driver, a woman from Atlantic City, was possibly trying to park when she accelerated over the sidewalk and slammed into the building, Lt. Mike Finnerty told The Press of Atlantic City.

Andy Lalasis from Galloway was in the social security building when the car crashed inside and said he saw "bodies flying." He was taken to AtlanticCare in Atlantic City with bruised ribs. pic.twitter.com/q2On8h8Od3 — Avalon Zoppo (@AvalonZoppo) November 13, 2018

Photos from the scene showed the 1998 Nissan Sentra sedan completely inside the Social Security Administration office. The car punched a large hole through the side of the complex.

A building inspector later determined the structure was safe, according to police. It was not clear when the facility would reopen.

A Social Security Administration spokesman said the office was closed until further notice, but in-person business can be handled at agency locations in Bridgeton, Toms River and Rio Grande. Local police were handling the investigation, the spokesman said.

The office serves residents in parts of Atlantic and Ocean counties, according to the spokesman, who said there was an average of 26 full-time staffers at the site.

Services are also available online or by calling 1-800-772-1213 or 1-800-325-0778 TTY. Agency services are also available online at ssa.gov.

Updates on the office will be posted at www.ssa.gov/agency/emergency.

Noah Cohen may be reached at ncohen@njadvancemedia.com. Follow him on Twitter @noahyc. Find NJ.com on Facebook.