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 Therapeutics Inc. has refused to pause all shipments of its Elevidys treatment after three deaths were linked to the company’s gene therapies, the Food and Drug Administration said Friday.

The company had previously halted shipments to certain older patients following the deaths of two teenagers treated with the therapy, Elevidys.