Pfizer Inc. PFE +1.71%, a pharmaceutical manufacturer, said on Friday that the majority of damage was caused by Wednesday’s tornado which ravaged through its Rocky Mount manufacturing facility in N.C. The warehouse contained finished drugs, raw material, and packaging materials.

Pfizer stated in a press release that the 1.4 million-square-foot facility, which produced nearly 8% all sterile injections used in U.S. hospital, will remain closed until damage assessment is completed. These drugs include anesthesia and drugs to treat infections. They also include other injections which are essential for the care given in emergency rooms, intensive-care units, and other settings.

The pharmaceutical giant stated that crews are working round the clock to restore electricity, assess the building’s structural integrity, and move the finished drug to alternative storage sites. Pfizer also said that it is looking for alternative locations to manufacture and sources of raw materials and supplies in order to replace the damaged ones. The release stated that “after an initial assessment there appears to be no major damage in the medicine production area.”

Pfizer CEO Albert Bourla stated in a press release that “there is a lot of work to be done.” The company reported that more than 3,000 Pfizer workers work on the site. All are safe.

The tornado’s damage, with its peak winds of up to 150 mph, has raised concerns among drug supply experts, that the disaster may worsen the current shortages of injectable steriles. Many sterile injections are minimally profitable generic products. They’re also difficult to manufacture, and they leave little room for errors because they’re injected directly into bloodstream. Experts in drug supply say that these factors have led to a widespread shortage of these important medicines.

According to the University of Utah Drug Information Service, more than 40% of new drug shortages in this year involve injectable medications. Pfizer’s recent report on injectables availability revealed that nearly half of the 500+ products were out-of-stock or depleted.

Experts say that policy changes are necessary to combat persistent shortages of this drug, due to its central role in hospital medicine. Researchers at the Brookings Institution published a report in late June that proposed incentives for improving the manufacturing infrastructure of generic sterile injections, rewarding hospitals for taking proactive steps to address shortages of the drugs and establishing a buffer stock of key injectables funded by the government to protect the supply chain from shocks.

Pfizer has said that it is working closely with the U.S. Food and Drug Administration and federal, state and municipal officials to restore full function to the Rocky Mount facility, which produced almost a quarter all Pfizer injectable steriles.

In a tweet posted on Thursday, Dr. Robert Califf, FDA commissioner, said that the FDA was aware of storm damage. He added that he spoke with Bourla in order to understand the extent and impact of the damage. Califf said, “We are closely following the situation.” The FDA stated on Friday that they had no further comments to make.

Pfizer also said that it will donate to local American Red Cross units and United Way in support of relief and recovery efforts.

Pfizer’s stock rose 1.7% on Friday, but has fallen 27% for the year. The S&P 500 , has increased by 18%.