The union for Boston Symphony Orchestra musicians in Lenox, Massachusetts, has authorized the first strike in the ensemble's 145-year history. This was reported by the AP agency.

The Boston Musicians' Association issued a statement ahead of the expiration of the union's three-year contract at 11:59 p.m. Sunday. Relations between the orchestra and management have been strained since the BSO decided in March to force out music director Andris Nelsons next summer after 13 seasons.

"In spite of the turmoil of the last six months caused by BSO's leadership decision to terminate the orchestra's musical director, Andris Nelsons, they have failed to agree to a collective bargaining agreement that would begin to restore the trust that they have destroyed and offer a fair contract to the musicians who are at the heart and soul of the BSO," the union said in a statement. The union said management has not agreed to the musicians' proposal for a mediator.

The BSO did not immediately respond to an email seeking comment. The orchestra's season is scheduled to open Sept. 17.