What the hell is going on in Los Angeles?

The top news story tonight, within the last hour, these are the headlines:

Explosion in downtown L.A. causes fires at several buildings; multiple firefighters injured

(LAT)

Major Fire, Explosion In DTLA Leaves At Least 10 Firefighters Injured

(CBS local 2)

4 Building Evacuated Due To Massive South LA Apartment Fire That Injured 2

(CBS KCLA)

That's a critical mass of the ledes. The only specific is from KCLA, "Apartment Fire". Nothing on cause. It's fucking spontaneous combustion for all you'd know from these reports.