Claim: While attending a 20-year anniversary ceremony to honor victims of the 9/11 terrorist attacks, U.S. President Joe Biden temporarily pulled down his COVID-19 mask to communicate something.
Fact-check: Did Biden Pull Down His Mask at 9/11 Ceremony?
Verdict: true
Organisation: Snopes
Author: Jessica Lee
Date published: 2021-09-15T10:57:00