A large fire erupted at a warehouse in Los Angeles, prompting a state of emergency declaration. Firefighters are actively battling the blaze, which is generating significant, dense smoke. The affected area, particularly Boyle Heights, is under health alerts due to the hazardous air quality. Authorities have not yet determined the cause of the fire, nor the specific contents of the warehouse, described only as a food storage facility. Residents are being advised to take precautions to avoid smoke inhalation and to stay indoors if possible. The situation remains fluid as crews continue to work to contain and extinguish the fire.