HILLSBOROUGH, N.J. (CBSNewYork) — Firefighters are still battling a massive warehouse fire in Somerset County.

Thick black smoke and flames can be seen billowing into the sky at Somerville Business Park in Hillsborough.

Route 206 is closed in both directions at Camplain Road for about four blocks.

Hillsborough Fire Department spokeswoman Pam Borek told WCBS 880 that the fire is up to five alarms and the fire it not yet under control. Two buildings are being affected.

People are also being told to stay indoors and to keep their windows closed.

There is no word yet on what started the blaze.

There are currently no reports of any injuries.