Four teaching unions took part in a half-day strike over pay - their first walkout in six years - with most schools closing until midday.
For health and public service unions, Unite, Unison, Nipsa and GMB, this is further action in a pay dispute.
Teachers, nurses, ambulance and hospital staff have been taking to picket lines.
Teachers, nurses, ambulance and hospital staff have been taking to picket lines.
2 / 3