Negotiations between teachers and the B.C. Public School Employers' Association, which represented the government, broke off earlier this month.
CUPE B.C. president Mark Hancock says a class disruption is now a possibility for this fall.
"We've made every effort to bargain a fair and reasonable settlement with the employers, but their lack of preparation is threatening to disrupt classes this fall," Hancock said in a statement released Sunday.
The 40,000-member teachers' union has been negotiating with the government since their previous contract expired in June.
"If the government doesn't show a commitment to bargaining, our members will take full-scale job action," said Colin Pawson, Chair of the BC K-12 Presidents' Council. "The clock is ticking."
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