This story has been updated with the list of streets that are blocked off and those that are open.

STRASBURG — Several streets in town are blocked off as hazmat crews work to clean up after an explosion at a local plant.

The incident happened early this morning in the 400 block of East King Street, the location of Valley Milk Products.

No injuries have been announced.

Shenandoah County Fire and Rescue and Woodstock Fire Department crews, as well as Frederick County Fire and Rescue hazardous material crews have been seen coming and going from the Valley Milk Products building located at 412 E. King St.

A strong odor of ammonia could be smelled in the area around 6:30 a.m. and people were seen leaving the area. Ammonia can cause burns and respiratory problems.

At 9:19 a.m. the. Strasburg Police Department released this list of streets that had been blocked off and those that are open:

• Eastbound King Street is open to Massanutten at this time.

• East King Street is still completely closed to Funk Street for an undetermined amount of time.

• South Massanutten is open.

The following streets are closed for undetermined amount of time:

• Eastbound King Street closed from Holiday to Funk.

• Westbound King Street closed from Funk to South Massanutten.

• South Massanutten closed From North Massanutten to Queen Street.

Police advised motorist to expect delays and find alternate routes.

Responding to the explosion are units from Strasburg, Middletown, Toms Brook, Woodstock, Mount Jackson, Shenandoah County, Hazardous Materials Specialist Milton Painter, the Shenandoah County Fire Marshal, the Strasburg Police Department, Virginia State Police, the Hazardous Materials unit and Hazmat Operations specialty team from Winchester and Frederick County, according to information from the Strasburg Police Department.

Leonard Saunders said he had just delivered some cream to the milk plant from North Carolina between 1:30 and 2 a.m. when he decided to doze off to get some rest before hitting the road again.

About an hour later he said crews were waking him, telling him to move from the area.

Streets in the area have been blocked off since before dawn.

"Please allow yourself extra time and avoid the area," the Emergency Communications Center message stated.

Several crews from state, regional and local authorities are at the scene. Incident command for the scene is staged in the area of the Strasburg Emporium and Jalisco restaurant.

The Shenandoah County Emergency Communications Center originally sent out a message at 4:11 a.m., stating that an explosion happened at the International Automotive Components plant building in the 500 block of East Queen Street.

But soon after a message was sent out saying the incident occurred in the 400 block of East King Street.

The Northern Virginia Daily will update this story as more information becomes available.

Contact Charles Paullin at cpaullin@nvdaily.com