The Metropolitan Police has referred itself to the Information Commissioner's Office aft the names of the alleged victims of the Westminster honeytrap ungraded were revealed to each other.
The force has apologised "sincerely for immoderate distress" aft an email was "sent successful error".
According to reports, the Met sent an email to each those thought to beryllium victims of the scandal - but alternatively of the email addresses of the recipients being hidden, they were disposable to each other.
Officers volition beryllium reminded that attraction should beryllium taken erstwhile sending radical emails, Sky News understands.
The email is understood to person been a short, regular update to the investigation.
A Met Police spokesperson said: "An email relating to an ongoing probe was sent successful mistake today.
"We recognise the interaction connected those progressive and apologise sincerely for immoderate distress.
"A referral to the Information Commissioner's Office has been made and we await proposal connected adjacent steps.
"Officers volition beryllium reaching retired to those impacted to personally apologise and supply reassurance."
The honeytrap ungraded was a sexting scam successful which astatine slightest 12 men successful governmental circles received unsolicited, flirtatious WhatsApp messages from radical calling themselves "Charlie" oregon "Abi".
Explicit images were exchanged successful immoderate instances.
Former Tory MP William Wragg resigned the whip aft helium admitted giving retired chap politicians' telephone numbers to the suspected perpetrator.
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The ICO earlier told Sky News it had not received a study from the Met Police; it has been asked again for an update pursuing the Met's announcement.
In its erstwhile statement, the watchdog said: "Organisations indispensable notify the ICO wrong 72 hours of becoming alert of a idiosyncratic information breach, unless it does not airs a hazard to people's rights and freedoms.
"If an organisation decides that a breach doesn't request to beryllium reported they should support their ain grounds of it and beryllium capable to explicate wherefore it wasn't reported if necessary."
Parliamentary authorities person besides been updated connected the incident.
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In June, a antheral was arrested arsenic portion of the probe into the scandal.
The Metropolitan Police said they arrested a antheral successful his mid-20s successful Islington, northbound London connected suspicion of harassment and offences nether the Online Safety Act.
Sky News understands that helium was a subordinate of the Labour Party, but has since been suspended.