The first fire broke out around 4 pm at an apartment complex near Recreation and Olive.
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The Fresno Fire Department says a maintenance worker used a fire extinguisher to stop the flames from spreading.
Officials say the maintenance worker and another person were injured in the fire.
Another fire started around 6 pm in the kitchen of a home near 4th Street and Thomas Avenue.
Firefighters say two people were injured in the fire.
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A third fire happened later in the night on Argyle near Tulare in Southeast Fresno.
Authorities believe an electrical issue sparked the fire between an apartment building and a carport.
Officials are helping the people living in the impacted units find an alternative place to stay.