UPDATE: Hillsborough warehouse fire: What we know, what we don't know

HILLSBOROUGH -- During a Friday morning press conference on the massive warehouse fire off Route 206, Hillsborough Township's Chief Fire Marshal Christopher Weniger said material burning in the blaze includes various commodities, storage containers, paper record storage and a significant amounts of plastic pellets.

The fire broke out Thursday afternoon at Veterans Industrial Park on Route 206 and continued to burn Friday morning.

The township's Health Officer Dr. Glen Belnay said air monitoring is continuing at the site and there does not appear to be any public health threat, but residents are advised to shelter indoors.

Bob Considine with New Jersey Department of Environmental Protection confirmed Friday morning that there were no air quality issues resulting from the fire.

EPA spokesman Elias Rodriguez said the state DEP is the lead agency in terms of the environmental impact. The federal agency is assisting in monitoring air quality, but it hasn't reached any conclusions yet, Rodriguez said.

Township schools have been closed and after-school events are also canceled, district officials stated on their Facebook page.

Hillsborough Township police asked Friday morning that residents in the areas of Camplain, Old Camplain and Sunnymead roads and Brooks Boulevard avoid exposure to the smoke and keep windows closed.

Hundreds of firefighters from multiple counties have been on the scene of the fire since it began just before 3 p.m. Thursday.

Somerset County officials said this morning they have sent their Fire Coordination, Emergency Medical Services and their Hazmat teams to the fire scene. The Emergency Service Training Academy off of Roycefield Road is being used as the main staging area for the firefighters to warm up and get food.

Robert Wood Johnson Somerset in Somerville, Robert Wood Johnson in New Brunswick and JFK Medical Center in New Brunswick all report no firefighters have been admitted with injuries to the medical centers.

The fire continues to burn out of control as firefighters from all over the northern and central part of the state battle the blaze, according to Morris County Office of Emergency Management Director Jeff Paul. Medical assistance is also being provided by many emergency medical services agencies.

"We continue to have Morris County assets on scene," he said. "Our support with the possible deployment of additional resources will continue to be assessed by the Morris County Office of Emergency Management and the Morris County Fire Coordinator in consult with officials from Somerset County."

Route 206 and Roycefield Road were reopened in both directions Friday morning, but Route 206 closed again at 10:30 a.m.

News12 reports one firefighter suffered a minor injury to his leg.

Officials said as of last night that air quality was not affected by the blaze. The site is formally the Defense Logistics Agency Depot, which once housed 12,500 barrels of mercury since the early 1940s. The last shipment of mercury left the township for Nevada in December 2010. The building where the mercury stockpile was removed a decade ago was not burned in the blaze and not a factor today.

Members of the Morris County Office of Emergency Management, along with members of the Cedar Knolls Fire Department, assisted at the scene overnight, Paul said.

The Morris County Mobile Ambulance Bus and the Morris County Tender Task Force were called in, as well as firefighters from Fairmount Fire Company in Washington Township, New Vernon, Boonton, Rockaway and Mount Arlington, Paul added.

Cristina Rojas may be reached at crojas@njadvancemedia.com. Follow her on Twitter @CristinaRojasTT. Find The Times of Trenton on Facebook.