Three Boeing defense plants face a strike as 3,200 machinists walked off their jobs. Members of the International Association of Machinists voted to strike.

Boeing machinists went on strike Monday morning, after the union rejected the company's contract offer for the second time in two weeks.

Thousands of members of a union representing Boeing defense industry workers in the US states of Missouri and Illinois went on strike Monday after rejecting a contract proposal.It came hours after the union said in a statement that members at Boeing facilities in Missouri and Illinois had voted to reject a modified four-year labor agreement with Boeing.