1.   Firefighters said they had to knock down the remaining walls - they have no other option.

2.   Firefighters say that a gas explosion destroyed the building.

3.   Firefighters say it was important to control the flames as quickly as possible because of the close proximity of petrol pumps.

4.   But firefighters say the heaters are potentially lethal.

5.   And firefighters said this is only the beginning.

6.   Another firefighter said he was grateful to the president and also to the crowds of people who cheer the rescuers on as they enter and exit the site.

7.   At one point, the fire threatened a mobile-home park off Sierra Highway, until the wind later shifted away from the park, firefighters said.

8.   Authorities are uncertain how the accident happened, firefighters said.

9.   Before the flames are finally snuffed out, they will be the worst in more than a century, veteran firefighters say.

10.   Both the elephant and Foster Farms chickens were damaged in the blaze, firefighters said.