Firefighters responded to One Hudson Avenue in Vinegar Hill on Wednesday morning following reports of four people trapped in an elevator 220 feet below grade, a spokesman said Wednesday. The facility is ConEd's Hudson Avenue Generating Station adjacent to the Brooklyn Navy Yard.

The call came in at 7:40 a.m. and firefighters were still working to rescue the trapped individuals as of 9:30 a.m. All four sustained minor injuries but are in stable condition, according to the FDNY.

"It's going to be a long process," an FDNY spokesman said. "We'll be on the scene for a while."

One ConEd worker and three contractors are currently trapped, according to ConEd spokesman Allan Drury, who added that an elevator technician is on site. "The information is sketchy until I get more," Drury added.

Emergency vehicles clustered around the generating station Thursday morning, according to a witness.

We'll update with any additional information.

[Update 10:00 a.m.]: One of the trapped individuals has been extracted from the elevator shaft, an FDNY spokesman said. All four are being pulled from the shaft in harnesses, using a "high-angle rescue" technique, he added.

[Update 12:00 p.m.]: All of the workers have been rescued. ConEd released the following statement Wednesday:

Members of the FDNY showed once again today why they are the best at what they do. City firefighters safely rescued four individuals - one of our employees and three contractors - who became trapped in an elevator approximately 200 feet below sea level this morning. We are grateful for their efforts and the assistance of all emergency responders who participated in this rescue.