The worst Ebola outbreak in history is heaping new pressure on U.S. regulators to speed the development of treatments for the deadly virus, which has killed more than 700 people since February.

The Food and Drug Administration on Friday said in an emailed statement it "stands ready" to work with companies and investigators working with patients "in dire need of treatment."

A senior official within FDA said the agency would consider proposals for providing treatments under special emergency new drug applications, if the benefits of the treatment outweighed the potential safety risks. "We take this very, very seriously," the source said.