First the massive Chevron refinery explosion in Richmond, now the Exxon Mobil refinery in Torrance has been taken offline:
Gas prices leap past $5 in Calif.Some Los Angeles-area gas stations shut off their pumps because of rationing by suppliers, and they displayed makeshift signs explaining that the shortages were not their fault. Drivers formed long lines at stations that did have gas; some stations raised prices to more than $5 a gallon for regular gasoline.

Prices at independent gas station Low-P in Calabasas, Los Angeles County, Oct 7, 2012
http://www.dispatch.com/content/stories/business/2012/10/07/gas-prices-leap-past-5-in-calif-.htmlAnd as usual, the gas thieves are at it again:
California sees record gas prices as police deal with fuel banditsCalifornia's average gasoline price set a record Saturday of $4.614 for a gallon of regular, up 12.8 cents overnight. Several service stations are charging more than $5 a gallon for regular gasoline.
Gasoline prices skyrocketed after the Exxon Mobil refinery in Torrance was knocked offline Monday by a power outage. Other lingering refinery and pipeline problems also contributed to the soaring costs at the pump.
Last month, police in the Antelope Valley were looking for thieves who stole gas from car and truck rental agencies.
Now, Police in Roseville are looking for gasoline thieves who struck two stations, taking nearly 1,000 gallons of the increasingly expensive fuel.
http://latimesblogs.latimes.com/lanow/2012/10/california-sees-record-gas-prices-as-police-deal-with-fuel-bandits.html