Boeing Co. has offered a new contract to the union representing some 3,200 factory workers in the St. Louis area, including the same 20% raise that members resoundingly rejected in an earlier deal while voting to strike.

Roughly 3,200 workers are striking at sites in Missouri and Illinois. Members of the labor union representing the workers rejected a modified contract offered by Boeing last week.

The strike started at three Midwest manufacturing plants after about 3,200 local members of the International Association of Machinists and Aerospace Workers voted Sunday to reject a modified four-year labor agreement,