From an email I got this morning:
As a valued King Arthur Flour customer and member of our baking community, we'd like to make you aware that we have voluntarily recalled a limited quantity of 5 lb. Unbleached All-Purpose Flour bags from six specific LOT codes:
BEST USED BY 12/07/19 LOT: L18A07C
BEST USED BY 12/08/19 LOTS: L18A08A, L18A08B
BEST USED BY 12/14/19 LOTS: L18A14A, L18A14B, L18A14C
More details available at Flour Recall