The Lagos State Emergency Management Agency (LASTMA) says the fire at the 22-storey Great Nigeria Insurance House on Martins Street, Lagos Island, has intensified across several floors.
Officials said thick smoke and rising heat were hampering access to upper floors, complicating suppression efforts and increasing danger to occupants and responders.
The agency warned the situation poses serious risks to lives, nearby structures and businesses, as well as members of the public within the surrounding area.
Dr Olufemi Oke-Osanyintolu, Permanent Secretary of LASEMA, disclosed the development in a statement issued late on Wednesday night.
He said the fire continued to spread vertically, requiring sustained multi-agency coordination and specialised equipment to prevent escalation.
Oke-Osanyintolu advised residents, traders and occupants of adjoining buildings to evacuate immediately to avoid casualties from smoke inhalation, structural failure or fire spread.
“Evacuation is critical at this stage to safeguard lives and reduce exposure to secondary hazards,” he said.
He said emergency teams, including LASEMA’s Shark Response Unit, Lagos Fire and Rescue Service and Lagos Ambulance Service, are conducting firefighting, rescue and containment operations.
He urged the public to remain calm, avoid the area, cooperate fully with responders and refrain from obstructing emergency operations.
Authorities said cordons have been established to control access, while safety assessments of nearby buildings are ongoing.
LASEMA said further updates would be provided as operations continue, reaffirming its commitment to protecting lives and property. (NAN)