The Los Angeles Fire Department has confirmed to OnCentral that nitrous oxide caused an explosion that happened behind a meat market near the intersection of Adams Boulevard and Grand Avenue last Wednesday.
"I can confirm that was nitrous in that cylinder," said LAFD spokesman Erik Scott on Monday. Previously, authorities had attributed the blast to an "unknown gas cylinder."
The explosion, which killed one and injured three, happened in a small unmarked building tucked behind Bembis Meat Market. A bumper sticker on the small building's door on Thursday read "NOSWerks," and NOSWerks' Twitter account indicated that it did at one point sell nitrous oxide refills: "Nos Refills $4 Grand Opening Jan. 27 Friday @ 4pm," read the account's single tweet, dated January 27, 2012.
"Nos" is typically slang for nitrous oxide gas. Some use the gas to improve the performance of certain vehicles, while others huff the compound for recreational use.
The L.A. County Department of Coroner said on Monday morning that the autopsy of the person who died hadn't been completed yet.