STOCKTON, Calif. (AP) — Wind-driven fires ignited in the brush along an interstate burned at least 30 homes and slightly injured two firefighters on Tuesday, a city spokeswoman said.

Paramedics treated some residents for smoke inhalation, but no one had been taken to a hospital, city spokeswoman Connie Cochran said. The two injured firefighters quickly returned to the fire lines, she said.

Fire officials have not determined a cause of the blazes.

Thick smoke slowed traffic along Interstate 5.