Jed Mercurio‘s acclaimed BBC2 crime drama series Line of Duty has been commissioned for a further two series.

The final episode of series two, starring Keeley Hawes, attracted an audience of more than four million viewers and drew glowing reviews from the nation’s TV critics, who described it as ‘toe-curlingly, cushion-clenchingly tense’ and the ‘drama of the year’.

“We’re profoundly grateful to the fans who not only watched Line of Duty, but also made it such a talking point, and to BBC2 for this rare and immensely flattering opportunity,” said Mercurio, whose TV credits also include Bodies and Cardiac Arrest.

“I can promise two new explosive cases for AC-12, new guest stars, further twists and turns and maybe even some surprise reappearances.”

The new series are part of a raft of new commissions announced to mark the 50th anniversary of BBC2, including the return of James Corden and Mathew Baynton in comedy thriller The Wrong Mans.