Oh crud, from that point of view it clearly explained,

"About 75 firefighters sent to the 600 block of South Santa Fe Avenue at 6:40 a.m. doused the flames in the single-story building in about 40 minutes, said Erik Scott of the Los Angeles Fire Department. No one was hurt."

75 were sent, 55 of them were fighting the fire. So you could say about 20 of them were there so they got a perfect excuse not passing their random drug test.