SEATTLE (AP) — Seattle hospitals rushed out COVID-19 vaccines to hundreds of people in the middle of the night after a freezer they were being stored in failed.

It’s not clear what caused the freezer failure Thursday night, but UW Medical Center and Swedish Medical Center received hundreds of doses that needed to be used before they spoiled at 5:30 a.m. Friday.

Word of the unexpected doses spread on social media, and long lines of hopeful vaccine recipients quickly formed.

Cassie Sauer, president of the Washington State Hospital Association, says no doses were wasted.