DAYTON — UPDATE @5:26 a.m.
Officials said a fire at a vacant Dayton duplex is considered suspicious.
Crews are working to learn where the fire started.
No one was injured.
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Fire crews are on scene of a structure fire in Dayton.
The fire was reported just after 4 a.m. Tuesday in the 300 block Nassau Street.
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Nassau Street is blocked off from Harper Avenue to Clover Street.
Initial reports indicate the flames started in the rear of the house. The house was heavily damaged.
As of 5 a.m., crews continue to fight the blaze.
This story will be updated as we learn additional details.