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 Boeing facilities in St. Louis; St. Charles, Missouri; and Mascoutah, Illinois, after about 3,200 local members of the International Association of Machinists and Aerospace Workers voted yesterday to reject a modified four-year labor agreement, the union said. Read more here.

The IAM union represents about 600,000 members across aerospace, defence, airlines, rail, healthcare, and more in the U.S. and Canada, making it one of North Americas largest industrial trade unions.