Live updates: Massive fire destroys Tracy warehouse; ATF joins investigation after sprinklers fail

All 120 employees safely evacuated a massive medical supply warehouse Thursday afternoon after a large fire erupted and cast dangerous embers across the community.

Tracy fire says no injuries were reported.

Fire officials say facility's inventory of cardboard and paper products fueled the flames, causing embers to spread up to 2.5 miles away.

The flying embers sparked three secondary fires:

More than 120 firefighters and 35 apparatus from multiple agencies, including the San Francisco Bay Area, responded to the blazes.

Investigators are looking into major safety equipment failures at the scene.

Arriving firefighters found that the first hydrants they connected to lacked water pressure, despite the system passing inspection in January.

Crews also reported that overhead sprinklers did not appear to be active when they arrived.

The Bureau of Alcohol, Tobacco, Firearms and Explosives is assisting local officials with the investigation.

Teams are currently reviewing facility video footage, checking inventory lists for hazardous materials, and monitoring local air quality.

Tracy fire officials said the blaze at the Medline facility is one of only three or four warehouse fires of its size in U.S. history.

Jamie Holt, with the San Joaquin Air Pollution Control District, spoke about how the smoke from the Medline facility fire in Tracy may impact the air quality.

Jamie Holt, with the San Joaquin Air Pollution Control District, spoke with ABC7 Eyewitness about how the smoke from the Medline facility fire in Tracy may impact the air quality.

Holt said the air quality in the area still considered good but does recommend those considered "sensitive" and "at-risk" to take precautions as the evening hours approach, such as turning on air purifiers and/or HVAC units, closing windows and wearing an N95 mask if you can smell smoke.

She said the air district did not consider any of the supplies in the burning warehouse to be toxic to the air quality.

After the fire is put out, Holt said residents should see improved air quality. While smoke will dissipate, she did say it will start to travel south of Tracy due to the winds, and may hit some communities in that direction.

Watch the full interview in the player above.

In a Thursday evening press conference, Tracy Fire Chief Randall Bradley said when firefighters made entry into the Medline Inc. warehouse, the sprinkler system was not operating.

Chief Bradley also mentioned that fire hydrants were not providing good pressure, which hindered their ability to attack the fire.

FedEx confirmed that all team members at its Tracy warehouse have been safely evacuated and accounted for.

In a statement, FedEx said: "We are aware of a building fire that started at a neighboring location before spreading to the Tracy hub. All team members have been safely evacuated and are accounted for. As this is an active situation, further questions should be directed to the local authorities."