Ford has said it is not using Takata airbag inflators in vehicles under development but is not issuing a recall or expanding previously announced recalls.

The automaker has recalled 1.51m vehicles globally with Takata air bag inflators. These include all Ford vehicles with inflators Takata has recalled, a Ford spokeswoman told Reuters.

Affected vehicles include 2005-2014 Mustang and 2005-2006 GT models, for driver side inflators, as well as 2004-2006 Ranger pickup trucks made in North America, for passenger-side inflators.

These vehicles had been recalled earlier, the Ford spokeswoman said.

Takata uses ammonium nitrate inflators which can become unstable, particularly when exposed to humid conditions over time, and explode with too much force, spewing metal fragments through a vehicle.

The National Highway Traffic Safety Administration banned ammonium nitrate in air bag inflators earlier this month, Reuters noted.