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A City worker fell to his death from the tenth storey roof terrace of an office building yards from City Hall.

The 23-year-old plunged from the top of the block at MoreLondon Riverside, near Tower Bridge on the South Bank, at around 7.45pm last night.

Witnesses told how there were screams of horror from terrified onlookers in the area packed with tourists, office workers and diners.

The man, who is believed to work for PwC, was pronounced dead at the scene despite attempts to save him by security guards and paramedics who raced to the scene.

The man, wearing a dark coloured suit, landed yards from Gaucho restaurant on a pedestrianised alleyway outside the accountancy firm’s offices.

A witness who works in tax for accountancy firm Ernst and Young, saw the fall.

The worker, who did not want to be named, said: “I saw it. It was horrible. I wasn’t looking up but I saw his silhouette falling against the sky with his legs and arms flailing and then heard a massive bang.”

The worker added: “I called security and medics were here quickly... I was with some younger colleagues who were really shaken up and upset by it.”

Barrister James Mason, 67, was at Gaucho waiting for friends when he saw the commotion outside.

He said: “I saw the security guards looking panic-stricken and running across towards the building.”

A 19-year-old bar worker said: “I was clearing glasses away when all of a sudden there was a really loud screaming noise and shouting from near the fountains.

“I looked across and could see people running towards a man on the floor.”

A 20-year-old bar worker added: “I came back from my break and saw people screaming.

“The ambulance was here within five minutes and police were here within two. They blocked the road at both ends.”

Scotland Yard said they did not believe the man’s death was suspicious and a file will be sent to the coroner.

A spokeswoman said: “Police were called to More London Riverside at 7.44pm following reports of a man fallen.

“Officers and London Ambulance Service attended and found a man in his twenties suffering from critical injuries.

“The man was pronounced dead at the scene.”

A spokesman for PwC said the firm was co-operating with the police.