A fire incident on Thursday afternoon in the trolley system linking the Rayburn House and the U.S. Capitol resulted in two police officers being hospitalized, according to authorities.

The D.C. Fire and EMS Department reported that emergency crews swiftly responded to the scene of a small electrical fire on the underground trolley, which was successfully put out.

Officials stated that two officers from the U.S. Capitol Police were transported to the hospital for medical evaluation.

The fire occurred within a tunnel that connects to the U.S. Capitol, as detailed by officials from the D.C. Fire and EMS Department.

Fortunately, no passengers on the trolley sustained injuries, according to official reports.

Details regarding the individuals present in the vehicle at the time of the fire remain unclear.

Firefighters are responding to an underground trolley fire in Washington, D.C. (D.C. Fire and EMS Department)

As of 6:25 p.m. local time, all smoke was cleared and authorities were clearing the scene.

The Metropolitan Police Department said Independence Avenue was closed in both directions between Washington Avenue, SW and Second Street, SE, but later reopened.

The cause of the fire has not yet been released.

The cause of the fire has not yet been released. (D.C. Fire and EMS Department)

The U.S. Capitol subway system is used to move lawmakers, aides and high-profile guests safely between government buildings.

Its three lines are operated and maintained by the Architect of the Capitol (AOC).

This is a developing story. Please check back for updates