PHOENIX (AP) - Arizona is facing a critical shortage of blood after donations fell during the holidays.
The state's primary blood supplier, Vitalant, issued an urgent call for donors on Friday.
The organization says there's less than a day's supply of the universal blood type, O-Negative, and less than a two-day supply of O-Positive.
Vitalant is seeking donors for a massive blood drive on Sunday in Tempe. Scheduled blood drives in other areas can be found at bloodhero.com.