Martyn Hett's dad tells of the moment his "world fell apart" in new documentary about the Manchester Arena bombing

The father of Martyn Hett tells movingly of the moment his 'world fell apart' on being told his son was missing in a new documentary ahead of the fifth anniversary of the Manchester Arena terror bombing. Much-loved PR manager Martyn was 29 and from Stockport - one of 22 murdered by suicide bomber Salman Abedi after an Ariana Grande concert on May 22, 2017.

Abedi's brother, Hashem, was convicted over the bombing and is currently serving a minimum prison sentence of 55 years for his role in the attack. And speaking to ITV for new two-part documentary 'Worlds Collide: The Manchester Bombing', Paul Hett says he believes the brothers' experiences of the war in Libya - and the influence of their father Ramadan Abedi - was the starting point for the eventual atrocity.

"I am not a believer that children are born bad," Mr Hett says in part one, which airs tonight at 9pm. "These weren't born bad. They were taken to Libya. They were trained to fight in the war over there and I believe that was the start of this because he [Salman Abedi] believed what Ramadan told him.

"He was brought up into that world, but people have choices. To kill 22 people or not to kill 22 people. Salman Abedi had a choice."

The series features powerful interviews with those who lost loved-ones in the attack, including from the family of 15-year-old Olivia-Campbell Hardy, from Bury, and from Paul Price, the partner of police officer Elaine McIver, 43. And it considers the missed opportunities to stop the bomber, intelligence failings on the part of the security services and the much-criticised response of the emergency services on the night.

Mr Hett says 2017 was 'going to be a very big year for Martyn'. "Life couldn't have been better," he says.