Hundreds of email addresses have been leaked in a blunder that saw consumers signed up to Watch Dogs' ARG website dotconnexion CC'd in on a promotional email.

An email was sent out to registered users last night informing them of an update to the website. But whoever sent the email accidentally included the recipients in the CC section, rather than BCC.

The mail-out included the email addresses of 500 users. Those affected are reported to be users with email addresses beginning with a number or the letter 'A'.

Those affected have apparently been hit by strings of unsolicited emails as a result.

The ARG email was sent out to inform users of Joseph Demarco's death - the artist targeted in the game's gameplay debut.

"It is with great regret that we inform you that Joseph Demarco passed away in a tragic, yet unexplained accident," read the email.

"Being one of the most important philanthropists in the local digital art scene, his demise has left a deep void in the community. Out of respect for his friends and family, the dotconnexion exhibition will be cancelled. Sincerely yours, The dotconnexion Team."

Ubisoft has yet to comment on the leak.