Approximately 10,000 gallons of crude oil sprayed on to the streets of Los Angeles after a high-pressure pipe burst. The oil was seen shooting up into the sky and onto streets and nearby businesses.
The Los Angeles fire department says the spill covered a half-mile area and is knee deep in some areas.
No injuries have been reported.
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A GoFundMe page was set up by the children's uncle to raise £15,000 for their funerals.
Lindsay Hoyle said his "family will never be the same" after the death of his 28-year-old daughter Natalie.
Police say they have traced four drivers who are thought to have hit the woman, and added that a fifth vehicle may also have been involved.