DICKSON CITY, Pa. — A massive fire late Wednesday forced the evacuation of 77 patients and all staff from Lehigh Valley Hospital in Dickson City after flames erupted on the roof of an attached building, authorities said.

Emergency responders were called to the hospital around 9:40 p.m. after a fire broke out on the roof of the original Scranton Orthopedics structure, which is connected to the main hospital complex, according to the Dickson City Fire Department.

Officials said the fire did not spread into patient care areas but caused smoke and water damage. Firefighters brought the blaze under control shortly before midnight.

Six intensive care patients were evacuated first, with hospital staff, local police, emergency medical services, the Lackawanna County Emergency Management Agency and Pennsylvania State Police assisting in the evacuation. No injuries were reported.

“All four floors of the hospital and the emergency department were evacuated,” Fire Chief Rich Chowanec said. “Everyone is safe.”

Chowanec said a firewall separating the orthopedic center from the main hospital prevented the fire from spreading further, limiting damage. Electricity to the building was shut off as a precaution.

Pennsylvania Gov. Josh Shapiro praised first responders for their rapid response, thanking them for protecting patients and staff.

State Rep. Bridget Kosierowski described the response as an “all-hands-on-deck” effort, noting that many patients were asleep when the evacuation began.

The Pennsylvania State Police Fire Marshal Unit is investigating the cause of the fire.