The investigation continues on all four fires from yesterday in East Sacramento and Midtown. Three of the fires were set in a span of two hours.
The Sacramento Fire Department says two of four fires in Sacramento yesterday have been classified as "suspicious."
The cause is undetermined for two others including last night's two-alarm warehouse fire on E Street.
Deputy Fire Chief Lloyd Ogan says it's too early in the investigation to link the fires together. Investigators are still gathering information.
"We're always looking for things that are similar, that could indicate a pattern, and then if we can determine that there is a pattern, then we start to dig into a little bit more what the details of that the pattern is. And, sometimes that helps us build a profile and other times we never get to a conclusion on that," says Ogan.
Ogan says the building on E Street is structurally unsafe. At least one wall must be supported before investigators can complete their work.
The other three fires were reported on 33rd, 49th, and near N and 39th between 11:40 a.m and 1:20 p.m yesterday.
Ogan declined to say what was used to start the fires that the department is calling suspicious.