BBC2's hit drama Line of Duty will return for a second series on BBC2 next year, it's been confirmed.

The police saga, which finished last night with an audience of well over three million viewers, will come back with another case for the fictional AC12 anti-corruption unit. This suggests that Martin Compston and Vicky McClure will reprise their roles as Steve Arnott and Kate Fleming, although casting has not been announced for the second series.

An average of 3.2 million tuned in across the five-part first series, making Line of Duty BBC2's biggest new drama since Rome in 2005.

Fans might have expected the dramatic series one finale to spell the end of Line of Duty altogether - but the programme was always intended by writer/producer Jed Mercurio to be one that would return, with each series telling the tale of a different officer under investigation.

BBC drama controller Ben Stephenson said Line of Duty "encapsulates my vision for bold, authored and utterly original drama on the channel", while BBC2 controller Janice Hadlow called the series a "brilliantly realised thriller" that was "a wonderful addition to the channel's rich landscape of drama".

Read our Line of Duty series one post mortem here.