The Food and Drug Administration plans to ask Sarepta Therapeutics Inc. to pause shipments of its Elevidys treatment after three deaths were linked to the company’s gene therapies, according to a person familiar with the matter.

U.S. regulators asked Sarepta Therapeutics on Friday to voluntarily halt shipments of its Elevidys gene therapy after a muscular dystrophy patient who received a different, experimental treatment died,

In a highly unusual move, Cambridge-based Sarepta said late Friday won’t comply with a request from the Food and Drug Administration to halt all shipments of its gene therapy.