(CNN) -- A 22-year-old woman was hospitalized after she fell down an elevator shaft at Fenway Park in Boston late Friday, authorities said.
"Somehow (the) elevator shaft doors on floor 4 opened," the Boston Fire Department said on Twitter.
The woman fell into the shaft, landing on the roof of the elevator, the department said.
Firefighters cut power to the elevator after stopping it on the 2nd floor, the fire department said.
Rescuers did not wait for a ladder; they used a chair and boosted themselves up through a hatch to the roof. They immobilized the victim and lowered her through the hatch, the fire department said.
The woman survived, but was transported to Beth Israel Deaconess Hospital.
She is in critical but stable condition, her identity is unknown.
The cause of the accident is unclear.
A state elevator inspector was called to the scene and Boston police will investigate, the fire department said.
The Boston Red Sox played the Detroit Tigers Friday night, losing 1-0.
CNN's Mariano Castillo and Carma Hassan contributed to this report.
™ & © 2014 Cable News Network, Inc., a Time Warner Company. All rights reserved.