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Line of Duty fans teased with thrilling 30 second clip ahead of season finale

In the trailer for Sunday night's episode, detective inspector Kate Fleming, played by Vicky McClure, appears holding a gun. Picture from BBC

LINE of Duty fans have been left on the edge of their seats after a thrilling 30 second clip was released ahead of the season finale.

In an explosive trailer for the last episode of the BBC One crime show, viewers were given a sneak peak of the action and drama set to come.

It has been five years since the anti-corruption unit AC-12 unit began to hunt for the corrupt officer 'H', with fans hoping that the finale will see the search come to an end.

It has been reported that the series, starring Vicky McClure, Adrian Dunbar, Martin Compston and Kelly Macdonald, will finish this weekend.

A seventh series has not yet been announced.

Sunday night's instalment of the police drama, created by Jed Mercurio, will also run for a longer 90 minute episode.

The trailer ahead of the finale opens with a montage of some of the key highlights of the series, including the smashed prison van, the Spanish siege and Gail Vella's murder.

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Then the voice of Superintendent Ted Hastings, played by Co Fermanagh-born actor Dunbar, can then be heard saying: "All these suspicious deaths were orchestrated by one officer in particular - H. The fourth man".

The trailer then shows characters who could be 'H', including chief constable Philip Osborne, deputy chief superintendent Patricia Carmichael and former deputy chief inspector Marcus Thurwell, played by James Nesbitt, as well as show favourites Hastings and detective inspector Kate Fleming, played by McClure.

During the footage, Detective Superintendent Joanne Davidson, played by Macdonald, is seen in handcuffs in prison after being charged with perverting the course of justice and malfeasance in a public office.

She is later seen being transported in a police van, asking: "What's going on?" as her prison guard looks away.

Fleming and Steve Arnott, played by Compston, are seen once again looking over the clue that 'H' cannot spell the word "definitely".

Fans have been quick to highlight that earlier Hastings spelt the word "definately", suggesting he could have further links to the organised crime group or even be H.

The trailer also shows Hastings telling his officers: "AFOs (Authorised Firearms Officers) will secure the suspect" with Arnott and Fleming holding guns and appearing to be involved in a shoot out.

The trailer also reads: "Every investigation has led to this" with the letter 'H' left on the screen.

However, the future of the drama is uncertain, with Mercurio revealing earlier this year to Radio Times: "We don't know. Since probably season four, we've been talking to the BBC about the realistic longevity of the series.

"It's an ongoing discussion is all I can say.

"A lot of it depends on the key creatives - me and the main actors - finding new stories to tell within that universe. We're in a situation where it's not entirely clear that there will be a seventh series.

"We would hope there could be."

Line of Duty is on BBC One on Sunday at 9pm.

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