A massive Pfizer manufacturing facility in North Carolina was severely damaged by an EF-3 tornado that touched down Wednesday afternoon. 

The National Weather Service reported that the tornado was on the ground for 16.5 miles and produced peak winds of 150 miles per hour in both Nash and Edgecombe Counties.

Pfizer’s facility in Rocky Mount, North Carolina, which has more than 1.4 million square feet of manufacturing space across 250 acres, is one of the largest sterile injectable facilities in the world. The drugmaker noted on its website that more than 400 million units leave the facility in a given year and that nearly 25% of all sterile injectables used at hospitals in the U.S. are produced at the site.

In a tweet, Pfizer confirmed that its Rocky Mount facility was damaged by the tornado, that workers there followed established safety protocols in order to evacuate and that all were safe and accounted for.

“We are assessing the situation to determine the impact on production. Our thoughts are with our colleagues, our patients, and the community as we rebuild from this weather incident,” the drugmaker said in a second tweet.

Pfizer CEO Albert Bourla followed up in a tweet sending his best wishes to the workers in the area and the Rocky Mount community as a whole.

“Our colleagues at the site do incredibly important work manufacturing sterile injectable products used by hospitals and health care providers around the world,” he tweeted. “We already have teams on the ground assessing the damage and supporting our colleagues, and we are working urgently to determine the best way to get back online as quickly as possible, while ensuring the safety of our people.”

More than a dozen people were injured during the storm, though a county spokesperson told media outlets present that the injuries were minor in nature.

Meanwhile, Nash County Sheriff Keith Stone said that large amounts of medicine produced at the factory were “tossed about” during the storm. 

“I’ve got reports of 50,000 pallets of medicine that are strewn across the facility and damaged through the rain and the wind,” Stone told the Associated Press.

The Rocky Mount facility, which came under Pfizer’s wing following the acquisition of specialty pharmaceutical and medication delivery company Hospira in 2015, is a key employer in eastern North Carolina, providing jobs for around 2,700 people. A company executive told WRAL in November that it is continuing to explore options for expanding its capabilities in the area.

In addition to Rocky Mount, Pfizer has another manufacturing facility in Clayton, North Carolina, which was not damaged during the tornado.

This article has been updated with commentary from Pfizer CEO Albert Bourla.