California Gov. Gavin Newsom says arson caused a massive fire that has indefinitely closed a vital section of a freeway in Los Angeles. The fire erupted Saturday in two storage lots under an elevated section of Interstate 10. The freeway is used by 300,000 vehicles daily and Monday marked the first weekday test for drivers. City officials say the morning commute was congested but there was no gridlock. But the evening commute saw significantly greater traffic. Officials Tuesday are renewing calls for people to do whatever they can to reduce traffic volume. The closure is expected to be felt beyond the city, including possibly slowing the transport of goods from the twin ports of LA and Long Beach.