Officials in multiple states said they were alerted late Wednesday that their second shipments of Pfizer-BioNTech’s vaccine had been drastically cut for next week, sparking widespread confusion and conflicting statements from Pfizer and federal officials about who was at fault…

A senior administration official, speaking on the condition of anonymity to discuss internal plans, said the revised estimates were the result of states’ requesting an expedited timeline for locking in their allocations for the following week; notification of how many doses they could order each week was consequently advanced from Friday to Tuesday. Since Pfizer is producing doses daily, the official said, fewer doses were available Tuesday than will be available on Friday.

But Pfizer released a statement Thursday that seemed to contradict that explanation, saying the company faced no production difficulties and had many more doses immediately available than were being distributed.

“We have millions more doses sitting in our warehouse but, as of now, we have not received any shipment instructions for additional doses,” the statement read.