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The cause of a warehouse fire on Spring Street early Thursday remains under investigation as crews continued working to put out hot spots at the scene of the blaze later that day.

In a statement from Klamath County Fire District 1, officials said the building was a total loss while nearby structures also suffered damage from radiant heat. Power lines overhead were also burned and required repair from utility workers.

The fire also spread to surrounding vegetation and crews had to respond to small brush fires started by falling embers.

No persons were reportedly harmed by the fire. An estimate of the total cost of the damage had not been calculated as of press time.

The fire was called in at 4:46 a.m. on the 800 block of Spring Street in the city’s warehouse district. Seven engine crews and two command vehicles were dispatched from District 1 as well as Kingsley Field Fire Department, Klamath County Fire District 4 and Keno Fire Department.

District 1 said suppression efforts were challenged by the rapid spread of the fire, which “completely demolished” the warehouse.

An investigation into the cause of the fire is being conducted by District 1 with support from Oregon State Police and Oregon State Fire Marshal’s Office. District 1 Fire Marshal Craig Andresen said an update regarding their investigation may be available Friday morning.

Those with information about a potential cause may call District 1 at 541-885-2056.