Police have been asked to investigate the "unauthorised access" of an email account linked to the Yes Scotland campaign.

The Daily Telegraph reported that police advised Yes Scotland to call in BT after the pro-independence campaign group received a media inquiry.

The inquiry appeared to be based on private emails.

The newspaper said BT found evidence the account had been accessed "a number of times."

A source confirmed to the BBC that Yes Scotland did not believe the email account had been accessed by someone associated with the organisation.

The source said BT was also investigating the apparent breach.

It is understood that "nothing has appeared yet" in the media based on the information in the emails, which the organisation has not revealed the contents of.

A Police Scotland spokeswoman said: "A complaint has been made by Yes Scotland regarding unauthorised access to an email account. The matter is being looked into."

A Yes Scotland spokesman said: "We can confirm that a complaint has been made to Police Scotland regarding unauthorised access to Yes Scotland email."