COLUMBIA - South Carolina safety regulators fined the Charleston Fire Department and a furniture store Thursday for violating safety standards in a blaze that killed nine firefighters.

The state Occupational Safety and Health Administration does not say that the violations directly led to the June 18 deaths of nine firefighters. It was the nation's single worst loss of firefighters since the 2001 terrorist attacks at the World Trade Center.

The combined fines totaled $42,100.

The report is one of handful of investigations into the blaze. The official cause of the fire has not been released. However, officials have said it started in a loading dock area where employees said they smoked cigarettes.

The state's workplace safety report cited the fire department for four violations, including one "willful" violation for having an inadequate command structure that could ensure firefighter safety in an emergency. In all, the department was hit with four violations totaling $9,325 in fines.

Charleston Mayor Joseph P. Riley Jr. said the city will fight the citations and has asked for a hearing to defend itself. He said that after the fire the city changed some of the policies that incurred the fines, but he believes the citations were unfair and wrongly issued.

"It's very important that we seek the truth and we keep the record straight," the mayor said.

Last month, a city-appointed panel reviewing the fire department made 20 recommendations, including improving leadership command at fires and hiring other top firefighting officials.

Among the other fines levied against the department Thursday were two for firefighters on the scene not wearing full protective gear, including air tanks and body protection. Mr. Riley said the city wants to know more about the air tank violation and said firefighters who were inside the store wore the breathing apparatus.

The Sofa Super Store was cited for a "willful" violation for having padlocked doors. It was also cited for fire doors that did not work and not having an emergency action plan in place for its employees.

One store worker was trapped during the blaze but was pulled to safety by firefighters.

On Thursday, store owner Herb Goldstein defended having the doors locked.

"Our managers locked the doors at closing time to keep criminals and transients out of the building, and only when there were no customers present," Mr. Goldstein said in a statement.

The store was fined $32,775 for three violations.

One of the serious violations involving the fire department involved it not having procedures in place for fighting a fire involving a metal truss roof, according to the report.

Steel trusses are prone to failure in fires because the steel weakens when heated. In the Charleston fire, witnesses reported the roof collapsing. The coroner said the firefighters died of burns and smoke inhalation.

The showroom, which was about half of the 60,000 square-foot store, had a steel truss roof. A fire official who went into the building has said the blaze spread from the loading dock to the storeroom front in the ceiling without his realizing it. The fine for the violation was $900.

The mayor said state officials had no policy of their own for fighting those types of fire before the furniture store blaze, so his department could not be accused of violating one.