Teachers Strike, Thousands of schools are closed as members of the two biggest teaching unions take strike action in a row over pay, pensions and workloads.
The walkout is affecting schools in 49 authorities in the east of England, the Midlands, Yorkshire and the Humber.
It is part of a continuing campaign of rolling regional strikes involving members of the NUT and NASUWT.
The government said the strike would disrupt learning, inconvenience parents and damage the reputation of teachers.
At least 2,500 schools are closed or partially closed.
Between them, the two unions represent nine out of 10 teachers. They are angry about changes to their pensions, increased workload and about government plans to bring in performance-related pay, from this autumn.
NUT general secretary Christine Blower said: “No teacher takes strike action lightly but the intransigence of this education secretary has left teachers with no choice.
“Teachers are saying ‘enough is enough’ – we have to do something about this”
” Ian Lever NUT, Leicester
“We cannot stand by and watch our profession be systematically attacked and undermined.
“There needs to be a change in the government’s attitude to teachers and education.”
Susi Artis, a spokeswoman for the NUT in Nottingham, said: “I recognise that for a lot of parents this is really inconvenient and we’re very sorry for that. Striking is very much a last resort.”
Ian Lever, from the NUT in Leicester, said: “Teachers are very angry about what is happening to the education system in this country and are prepared to make a stand on it.