Schools are set to close after teachers voted for strike action following a bitter pay dispute.
Any walkout would be the first national strike since the 1980s. On a turnout of 71 per cent, 96 per cent members of the EIS trade unions supported strike action.
The vote follows a separate consultative ballot, where 94 per cent of EIS members rejected a 5 per cent pay offer and 91 per cent said they would be willing to move to strike action. Scotland faces a crippling winter of discontent, with nurses also voting for a strike.