A senior firearms officer who shot a man wrongly suspected of being a terrorist after the 7/7 bombings will speak publicly for the first time in a new documentary.

Brazilian Jean Charles de Menezes was shot dead a fortnight after suicide bombers exploded devices on three Tube lines and a London bus on July 7 2005, killing 52 people.

The senior firearms officer who will appear in Channel 4’s Shoot To Kill: Terror On The Tube has remained anonymous for nearly two decades.

Alisa Pomeroy, head of documentaries at Channel 4, said: “I hope that hearing the personal testimony of the firearms officer involved in the tragic shooting of Jean Charles De Menezes will help the British public understand the complexity of the atmosphere in London that summer, and what was subsequently the events surrounding what became one of the biggest crises in British policing history.”

Would-be suicide bombers targeted the transport network again on July 21, but their devices failed to explode.

The following day, 27-year-old electrician Mr de Menezes was mistaken for one of them and shot seven times by two marksmen at Stockwell Tube station, south London.

On July 23, Scotland Yard confirmed Mr de Menezes was not connected to the July 21 attacks.

Dame Cressida Dick, who was promoted to Metropolitan Police commissioner in 2017, led the operation in which Mr de Menezes died.

A jury cleared her of any blame in his death at the end of the prosecution of the Met under health and safety laws.

Sir Tony Blair, who was prime minister at the time, and Gesio de Avila, a close friend of Mr de Menezes, have contributed to the two-part documentary, with senior police officers and civilian witnesses also featuring.

The programme will look at the marksman’s “understanding of the role of the police as ‘goodies vs baddies’” and “the pressure of being at the centre of one of the most controversial moments in the history of British policing.”

Dov Freedman, chief executive and co-founder of production company Curious Films, which made the documentary, said: “The films capture a very specific moment in the summer of 2005 when the UK was living under the very real threat of terrorism, and air of huge uncertainty and tension was high across the nation.

“The access to the previously anonymous firearms officer is unparalleled, with his candid interview providing unique insight about that time.”

Shoot To Kill: Terror On The Tube will air on November 10 and 11 on Channel 4.