UPDATE: This story was updated Sept. 3 to include the C-Band Alliance's response.

PARIS — Satellite fleet operator Eutelsat has quit the C-Band Alliance of four operators negotiating with U.S. regulators on a planned auction of C-band spectrum to 5G networks, throwing the alliance’s mission into doubt.

In a Sept. 3 statement that was as vague as it was brief, Eutelsat said:

“Eutelsat announces its withdrawal from the C-Band Alliance (“CBA”), which . . .

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