SPOILER ALERT In Sunday's Line of Duty, Kate Fleming was seen in a tense shootout in final scene Show ended with fans hearing gun shots but not knowing if anyone had been hit Filming snaps taken in September 2020 show Vicky McClure working on scenes yet to air, suggesting she survives and features in series six's final two episodes A man wearing a balaclava is also seen at the shoot, suggesting series four's infamous Balaclava Man could potentially make a reappearance Bent prison officer Alison Merchant is also seen in the pictures taken last year It has been revealed that 10million viewers tuned in to watch Sunday's show