School pupils faced disruption to their lessons on Tuesday as teachers in the north of England staged strikes in the long-running dispute over pay.
Schools were forced to restrict access to some students while others closed fully during the latest walkouts by the National Education Union (NEU).
Years of underfunded pay increases have “pushed the profession to its limits”, NEU leaders warned as they called for “proper negotiations” with ministers.
The NEU has estimated that around 200,000 members will go on strike across three days of action this week, with the “majority of schools” expected to either restrict access to certain year groups or fully close.