Hundreds of teachers demonstrate to call for better salaries
Strike on February 11 as unions threaten new wave of protests
teachers' unions
Academic year to start in early September as talks between authorities and unions fall through
Education department says plans for next year fixed after unions fail to attend sector meeting
Teachers' unions call five-day strike for second half of March
Protest to be held on March 15, 16, 17, 29 and 30 to reject starting the academic year earlier