A leading councillor has called for an inquiry after a confidential report into the future of secondary education in Powys was leaked to the media.
Leslie Davies, leader of the Liberal Democrat group on Powys Council, said the upset caused to schools, pupils and parents was "unacceptable".
He has urged the authority's chief executive Jeremy Patterson to launch an inquiry into "this whole debacle".
Powys Council has been asked to comment about the situation.
The confidential council report listed four options for the future of secondary education in the county.
One option favoured closing seven high schools, while another suggested closing school sixth forms and creating centres at a further education college in Newtown, Llandrindod Wells and Brecon.
'Breakdown of trust'
Mr Davies said: "I am so angry that this has happened.
"The upset this has caused to schools, pupils and parents is quite unacceptable.
"The breakdown of trust between the council, its schools and its residents through this leak will have to be repaired as soon as possible if we are to move forward with what is best for our children and their education.
"I have met today with Jeremy Patterson, chief executive, to demand that an inquiry is held as soon as possible into this whole debacle."
He added: "I want to reassure every parent that no decisions have been made.
"Also, that nothing in secondary education will change until there has been a full consultation process to establish the preferred way forward."
Meanwhile, pupils at Gwernyfed High School, near Brecon, one of those under threat, have started a campaign on the social networking site, Facebook.
More than 700 people have joined the campaign so far.