Cereal plants belonging to the Kellogg Company came to a standstill on Tuesday as nearly 1,400 workers jointly went on a strike, according to US media reports. However, there was no clarity if the supply of the cereal boxes would be hampered.

The strike includes plants in Omaha, Nebraska Battle Creek, Michigan; Lancaster, Pennsylvania; and Memphis, Tennessee, according to reports from Associated Press.

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Daniel Osborn, who is the President of a local union in Omaha, said that the group and the company had shared disagreements for more than a year while clearing the reason for the strike.

These disputes include issues related to premium health care, pay, retirement benefits, holiday and vacation dues.

Anthony Shelton, who is the President of an international union, said in a statement, “The company continues to threaten to send additional jobs to Mexico if workers do not accept outrageous proposals that take away protections that workers have had for decades”, according to reports from Associated Press.

While responding to the Mexico threat made by the cereal giant, Osborn said, “A lot of Americans probably don’t have too much issue with the Nike or Under Armor hats being made elsewhere or even our vehicles”, according to Associated Press reports.

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He added, “But when they start manufacturing our food down where they are out of the FDA control and OSHA control, I have a huge problem with that.”

Kellogg Company said that the offer made by them was fair and said that they would increase wages and benefits for the employees.

“We are disappointed by the union’s decision to strike. Kellogg provides compensation and benefits for our U.S. ready to eat cereal employees that are among the industry’s best,” Kellogg spokesperson Kris Bahner said in a statement.

Osborn said he expects the company to try to bring non-union workers into the plants at some point this week to try to resume operations and maintain the supply of its products.

Osborn said that the workers who are not associated to any unions may be reached out by the company in order to resume their operations and ensure a steady supply, reaffirming Kellogg’s acknowledgment of “implementing a contingency plan.”