LIVE UPDATES: Massive fire engulfs Medline warehouse in Tracy

TRACY, Calif. - Flames tore through a warehouse in Tracy on Thursday afternoon, sending thick black smoke billowing into the sky.

Firefighters responded to a structure fire at a Medline warehouse in the 5700 block of Promontory Parkway. Medline is a major distributor of medical supplies.

Building fully engulfed, nearby facilities evacuated

What we know:

Tracy Police Sgt. Michael Richards said the warehouse was fully engulfed in flames. Richards said the site has flammable materials inside, but could not elaborate on what those were.

The building was evacuated, along with several nearby facilities, including a FedEx building where flames could be seen spreading toward the property, though it was untouched.

At 1:41 p.m., Tracy police said officers were assisting with evacuations and directing traffic in the area.

Richards said no injuries had been reported.

South San Joaquin County Fire Chief Randall Bradley said the fire originated from the roof of the facility. 

Bradley noted that the sprinkler system was not operating at the time of the fire, though it remains unclear as why. 

Medline says employees are accounted for

What they're saying:

A Medline spokesperson confirmed the fire broke out at one of the company's distribution facilities.

"All Medline employees and on-site personnel are accounted for. We are coordinating closely with local authorities and first responders as we assess the fire's impact and will share more details as they become available," the company said in a statement.

Traffic impacted

Authorities urged residents and motorists to avoid the area and use alternate routes.

The California Highway Patrol's Dublin division said the fire was affecting traffic on Interstate 580.

Promontory Parkway remained closed as crews worked to contain the fire and secure the scene.