More than 3,200 union members who assemble Boeing's fighter jets in the St. Louis area and Illinois went on strike on Monday after rejecting a second contract offer the previous day.

The union representing Boeing employees have begun a strike after about 3,200 workers at facilities in St. Louis and other locations voted to reject a modified four-year labor agreement.

About 3,200 union members at Boeing facilities in Missouri and Illinois went on strike at midnight on Monday after rejecting an offer from the company, the union said.