Emily Watson has been cast in an upcoming BBC One drama about the 2005 London bombings.

The actress will play the mother of a girl called Jenny who was killed in the bombings, according to Radio Times.

The drama, A Song For Jenny, is based on Julie Nicholson's memoir A Song For Jenny: A Mother's Story of Love and Loss. It will be adapted for the small screen by Irish playwright Frank McGuinness.

Watson said of her role: "Although daunted by the task ahead, as a Londoner who was there on 7/7, I feel honoured to be part of the team asked to tell this compelling story. I hope we can do it justice."

Nicholson added: "Despite the poignancy of the subject, I am delighted that my memoir has inspired the re-telling of Jenny's story for film. I believe it is in safe hands and I have long admired and respected the work of Frank McGuinness."

A Song For Jenny will air on BBC One in July 2015, marking the 10th anniversary of the attack.