On the go and no time to finish that story right now? Your News is the place for you to save content to read later from any device. Register with us and content you save will appear here so you can access them to read later.
He said: "I kept thinking about another attack or a bomb going off."
"We were there for our safety but being in that big crowd just made me feel even more of a target."
The British Lionhearts released a statement after the attack to say that their boxers were safe and were still due to fight the next day.
Despite witnessing such a horrific incident, the boxers all fought and beat the visiting Italian team.
Clarke added: "It was the atmosphere: everyone's talking about it, I couldn't get away from it. But I'm not the victim; I was able to box.
"If we can't get in there and fight after what we saw, how does everyone there get on with their lives? Police officers lost colleagues, families, friends. We were the lucky ones so we had every reason to get in there and put a show on.
"Everything's gone through my head. But someone was looking down on us; we didn't go out there (in time to be caught up in the attack)."
Masood launched 82 seconds of terror on London when he drove a rented Hyundai into pedestrians on Westminster Bridge and then into Parliament's gates.
Officers from the Metropolitan Police were investigating whether the attacker was acting with others, and MailOnline revealed he had been signed into his Whatsapp just minutes before the attack.
But in the latest update from Scotland Yard, detectives say they don't think he had an accomplice, and that they may never work out why he carried out the attack.
Image 1 of 16: Police forensic officers at the scene close to the Houses of Parliament in London. Photo / AP
Four people, excluding Masood, died after the terror attack, including hero officer including PC Palmer, Londoner Leslie Rhodes, 75, US tourist Kurt Cochran, 54, and mother-of-two Aysha Frade, 43. A further 15 people are still being treated in hospital.