NEW YORK (CBSNewYork) — New York City is putting contingency plans in place as two school bus companies threaten to go on strike.

Teamsters Local 553 union members at Jofaz Transportation and Y& M Transit voted to authorize the strike on Tuesday.

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The two bus companies serve parts of Brooklyn, Queens and Staten Island.

The strike would affect 12,000 public school students and about 2,500 private school students.

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Mayor Bill de Blasio said there’s a high likelihood that the issue could be resolved Monday.

“We are very hopeful of reaching a resolution in time to keep the school buses running and not disrupt our kids getting to school,” the mayor said.

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De Blasio said in the event of a strike, the city would offer free Metro cards or reimbursements for car transportation to affected families.