Nigeria’s Dangote refinery has bought at least 16 million barrels of Nigerian crude oil for delivery in October, tightening the country’s export supply as buyers seek alternatives to disrupted Middle Eastern shipments.

Four industry sources told Reuters⁠ that the purchases were assembled through Nigerian National Petroleum Company allocations and additional cargoes acquired through tenders.

The volume is equivalent to approximately 520,000 barrels per day and would provide most of the crude required by Dangote’s 700,000-barrel-per-day refinery during October.

The final quantity could rise if the refinery makes further purchases. Dangote did not respond to Reuters’ request for comment.

Dangote’s growing claim on Nigerian crude