(Bloomberg) -- U.S. auto safety regulators are determining whether 70 million to 90 million more Takata Corp. air-bag inflators should be recalled, Reuters reported, potentially expanding the industry’s broadest ever safety crisis.

The inflators built with a chemical propellant called ammonium nitrate may be recalled because they endanger drivers, Reuters reported, citing a person with knowledge of the matter. The National Highway Transportation Safety Administration is investigating all Takata inflators using ammonium nitrate and hasn’t found enough evidence to direct automakers to recall additional inflators, spokesman Gordon Trowbridge told Reuters. Trowbridge didn’t immediately respond to an e-mail sent outside normal business hours.

Takata is cooperating fully with regulators and its customers, and continues to test inflators, build replacement air-bag kits and raise consumer awareness of recalled vehicles, spokesman Hideyuki Matsumoto said. He declined to say how many inflators with ammonium nitrate Takata has produced.

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