SKY7 was over one of the two fires near Interstate 280 and Bascom Avenue. The second broke out nearby just south of I-280, along Highway 17 and the third was near Highway 101 and the Interstate 680 interchange.
MORE: Man arrested in Morgan Hill after confessing to setting 15 South Bay fires, police say
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The CHP has confirmed its investigating this incident as arson and that one person has been arrested.
San Jose fire officials say a tree that burned in the fire along Highway 17 is in danger of falling and blocking some lanes.
The CHP a SIG alert in that area as they worked to make sure that tree was safe and canceled it just before 6 p.m.
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No structures are threatened and no one was hurt.