According to the Telegraph's report on the events yesterday, after the "technical error" in publication of the Ministry of Defence report was uncovered by the press, the paper went on to investigate other documents on government websites, claiming to find four similar examples from three separate departments.
"The Daily Telegraph discovered the security breaches yesterday after the Ministry of Defence admitted that secrets about Britain's nuclear submarines were obtainable from a government report online," the paper said in its report.
"A technical error meant blacked-out parts of the report could be read by "copying and pasting" its contents into another document.
"Details included expert opinion on how well the fleet could cope with a catastrophic accident. It was replaced with a secure version of the document yesterday."
The Telegraph said the material relates to Whitehall documents published under the Freedom of Information Act.
"After examining a small sample of the thousands of documents published under FOI laws yesterday, this newspaper was able to uncover information that should remain confidential under the law.
"Many of the security breaches have arisen from the way some documents are redacted in electronic form."
At the weekend the BBC reported the Ministry of Defence was told about the mistake by the Daily Star Sunday.
In a statement a MOD spokesperson said as soon as the department was aware of the incident it took "immediate steps to ensure the document was removed from the public domain and replaced by a properly redacted version".
"We will check past FOI responses and review our processes for the release of sensitive information to prevent any recurrence of this type".
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