Photo: courtesy of Channel 5/CBS Local

The two homes that caught on fire in the Berkeley hills on Wednesday night suffered more than $1 million in damage, according to Deputy Fire Chief Gil Dong.

The houses at 1005 and 1007 Miller Avenue near Grizzly Peak Boulevard suffered extensive structural damage, he said.

Fire officials do not yet know what cause the fire, which erupted shortly after 8:30 pm and sent flames shooting up more than 60 feet in the air. Four fire fighters were injured in the blaze, which was contained by 10:41 pm, said Dong. Two suffered heat exhaustion, one sprained his knee, and one sprained his ankle, he said. Three needed to be treated briefly at the hospital.

Six people from two different families were living in the two homes, said Dong.

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Frances Dinkelspiel, Berkeleyside and CItyside co-founder, is a journalist and author. Her first book, Towers of Gold: How One Jewish Immigrant Named Isaias Hellman Created California, published in November...