The Associated Press is reporting that the company that makes "pink slime" is suspending operations at three of four plants where the low-cost beef filler amid a public outcry over concern about the ingredient.

Beef Products Inc. spokesman Craig Letch on Monday told AP about the operations suspensions at plants in Texas, Kansas and Iowa ahead of a public announcement about the plan. The company’s plant at its Dakota Dunes, S.D., headquarters will continue operations.

The ammonia-treated additive known by the industry as "lean, finely textured beef" has been used for years but recently became a target of activists seeking to have it banned from supermarkets and school lunches. The U.S. Department of Agriculture decided to allow school districts to stop using it. Some retail chains have pulled products containing it.