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,

Sarepta has refused to suspend all dosing of its gene therapy for Duchenne muscular dystrophy, Elevidys, defying a clinical hold request from the FDA.