The final episode of Sherlock has been leaked online

The internet could be full of spoilers before the show airs tonight...

Creators of the BBC TV series Sherlock are urging fans not to watch an online leak of the final episode of the season or to share details about it online. The third instalment of the show is supposed to air on BBC One tonight but the episode has been illegally leaked online over the past 12 hours, prompting a response from the show. https://twitter.com/Sherlock221B/status/820299467341504513 Sherlock producer Sue Vertue also tweeted: "Russian version of #Sherlock TFP has been illegally uploaded. Please don't share it. You've done so well keeping it spoiler free. Nearly there." https://twitter.com/suevertue/status/820298121552936965 A preview screening of the series finale was held on Thursday for TV critics and journalists. The series finale will air on BBC One at 9pm on Sunday. In the meantime, have a look at the trailer for tonight's episode below... https://www.youtube.com/watch?v=VVcjBlKka74 Video via Sherlock