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Line of Duty fans are adamant they've spotted 'balaclava man' in the season finale.
"BTS Filming. Uploaded by someone on YouTube a while ago but it is now clear this must be from the final episode... [S6 spoiler]," the post read.
In both the behind the scenes clip and a trailer released earlier this week, it seems we can expect some sort of ambush in Sunday night's episode.
And at the end of the clip, we see a man in a balaclava being led away by armed officers.
As fans will know, balaclava man is the pseudonym given to various members of the OCG. Originally thought to be just one person, the identity of balaclava man has been a mystery since Season 4.
However, it was eventually revealed by Jimmy Lakewell that all members of the OCG wear balaclavas to cover their faces - so perhaps this means numerous members of the OCG will be appearing in the season finale?
It's not clear what will be unveiled, but let's face it, the finale looks like it'll be a dramatic watch!
You can see the trailer below:
If the trailer is anything to go by, it certainly seems like we could find out the identity of H this weekend.
The 30 second snippet shows the infamous misspelling of definitely as 'definately' - a defining feature of H's communication. But who could it be?!
There are a number of theories over the elusive H's true identity. Earlier this week, we told you how viewers are convinced H could be DCI Patricia Carmichael (Anna Maxwell Martin) after a morse code clue in Sunday evening's episode.
During a scene in which DCI Carmichael was interrogating Jo Davidson (Kelly Macdonald) viewers noticed that she tapped her pen down on the desk four times.
Four dots represents the letter H in morse code - and it did not go unnoticed by fans.
Could she be H?! There's only one way to find out - Line Of Duty continues on Sundays at 9pm, on BBC One.
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