The American Red Cross declared a national blood crisis Monday, marking only the second time in the organization's history that it has issued such a declaration.
There does not appear to be enough donated blood to meet demand among hospitals and patients in need, according to the nonprofit.
More gay and bisexual men will be able to donate blood after the Red Cross announced Monday it would follow recent guidelines from the U.S. Food and Drug Administration.
The American Red Cross has opened a shelter to families and individuals whose homes were hit by an EF-3 tornado Wednesday.
Preliminary reports show the deadly tornado in Mississippi stayed on the ground for more than an hour.
A year after the American Red Cross issued its first ever national blood crisis, supply levels have markedly improved.