The Mayor of Los Angeles has declared a state of emergency due to a fire ignited at a cold storage warehouse. The fire, which has been burning for several days, is emitting toxic smoke clouds and has prompted authorities to issue shelter orders for residents in the area, reports IPN.

The intervention is extremely difficult due to the building’s configuration and the lack of visibility inside. According to CNN, firefighters were temporarily forced to withdraw their teams due to a possible ammonia leak, a cooling agent used in refrigeration facilities. Helicopters were dispatched to the area for aerial interventions, as the flames risked spreading.

The authorities have asked residents to stay indoors, close windows and doors, turn off ventilation and air conditioning systems, and avoid traveling in the affected area. Temporary centers have also been opened for families affected by the toxic smoke.

The state of emergency declared by the city hall allows authorities to request additional assistance and accelerate access to resources for managing the situation. According to CNN, which cites local authorities and emergency services, firefighters have managed to handle the component related to hazardous materials, but continue to face biological and logistical challenges generated by the huge amount of stored products, almost 40 thousand tons. The cause of the fire is still under investigation.