Los Angeles Unified principals and administrators will join teachers and school workers on picket lines beginning April 14, after their union announced Friday afternoon that members overwhelmingly approved a strike authorization vote.

The Associated Administrators of Los Angeles, affiliated with Teamsters Local 2010, said 90% of voting members approved a strike authorization, and leaders announced plans to join a “sympathy strike” beginning April 14 alongside United Teachers Los Angeles and SEIU Local 99.

The vote marks the first time administrators have joined a strike alongside other LAUSD unions and aligns all three major labor groups in a coordinated potential walkout, raising the likelihood of widespread disruptions in the nation’s second-largest school district.

“When 90% of us vote YES, it’s no longer a request — it’s a mandate,” AALA/Teamsters Local 2010 president Maria Nichols said in a statement after the vote results were released. “Enough is enough, we are united, we are resolute, and we are ready to stand together for the respect, fairness, and dignity we deserve.”

The union represents around 3,000 principals, assistant principals, classified managers and school administrators across the district.

United Teachers Los Angeles, which represents about 37,000 teachers, and SEIU Local 99, which represents roughly 30,000 school support staff, have already set April 14 as a potential strike date if contract agreements are not reached with the district.

The unions have been negotiating with the district for more than a year over wages, staffing levels and working conditions. UTLA and SEIU Local 99 have previously authorized a strike by 94% and 97%, respectively.

District officials said earlier Friday that negotiations are ongoing and that they remain committed to reaching an agreement, and that school operations would depend on which employees ultimately participate.

If no agreement is reached, the coordinated walkout could affect tens of thousands of employees and more than 500,000 students across the nation’s second-largest school district.

This is a breaking news story, please stay tuned for updates