NEW YORK (AP) -- The U.S. Department of Transportation is again urging owners of vehicles with defective Takata air bags to seek repairs immediately.

The agency singled out Ford Rangers and Mazda B-Series trucks from 2006, which are under a "do not drive" warning. The agency said Monday that it is "deeply concerned" that they are not being returned for repairs quickly enough.

Chemicals used to inflate the air bags can deteriorate in some conditions, causing them to explode with too much force and blow apart a metal canister that can lead to hurling shrapnel.

At least 22 deaths and more than 180 injuries have been linked to the defect. Some 50 million Takata air bag inflators have been recalled in the United States and millions more globally. Lawsuits are pending against the company.

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