The public school board employing thousands of striking school support workers says the union representing them has left the bargaining table.

Some 3,000 staff, from educational assistants to cafeteria workers, have been on picket lines for almost a full month over a wage dispute with the Edmonton Public School Division.

In a letter Wednesday, Superintendent Darrell Robertson said the division and union remain far apart and that the union is focusing on wage increases that "far exceed" what the d…