ITV News understands that two Birmingham schools run by the same educational trust have been criticised by Ofsted for apparently failing to protect pupils from the risks of extremism.
Golden Hillock School and Park View Academy have both now been rated "inadequate" and placed into special measures.
The two schools are both run by Park View Educational Trust, which also manages a primary school.
A copy of the Ofsted report into Golden Hillock says "too little is done to keep students safe from the risks associated with extremist views".
ITV News understands that the report into Park View Academy (PVA) contains similar criticisms and that its acting principal, Monzoor Hussain, has now stepped down as acting headteacher.
It is also claimed staff at PVA have expressed concerns about both the governors and the leadership team and that they do not have faith in them.
Asked for a response to the claims, Park View Academy refused to comment.
The leaking, from her department, of a letter to Michael Gove, raises serious questions for the Home Secretary to answer.
One school was praised by Ofsted for using money from the pupil premium to pay for a number of cultural trips to Saudi Arabia.
Six Birmingham schools will be rated 'inadequate' and several more downgraded. Council officials have been criticised for failing to act.