Explosion rocks downtown Los Angeles Arts District

Crews go back to work after roofing installation that utilized propane and a pot of tar exploded at this building in the Arts District.

(Katie Falkenberg / Los Angeles Times)

Jan. 28, 2016 8:59 PM PT

Crews working in the Arts District building watch from the other side of the street as firefighters put out the fire.

(Katie Falkenberg / Los Angeles Times)

Fire crews pack up after a tar pot and propane explosion from a roofing operation in the Arts District.

(Katie Falkenberg / Los Angeles Times)