A strike at Boeing's defense unit halts fighter jet assembly, including F-47 jet production, as 3,200 employees walk out over failed contract negotiations.

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 Sunday to reject a modified four-year labor agreement, the union said.