Britain's Prince Harry is denouncing the paparazzi photographers who chased after Princess Diana the night she was killed in a car wreck. He speaks out in a new BBC documentary about the accident in Paris and the extraordinary reaction to Diana's death 20 years ago next week. Harry and his brother, Prince William, appear in the documentary.

"I think one of the hardest things to come to terms with is the fact that the people that chased her into the tunnel were the same people that were taking photographs of her while she was still dying on the back seat of the car," Harry said.

In the new documentary, he not only blamed the paparazzi for the crash that killed his mom, but accused them of standing by and watching her die, reports CBS News correspondent Jonathan Vigliotti.

"She'd quite a severe head injury but she was very much still alive in the back seat and those people that caused the accident, instead of helping they were taking photographs in the back seat and then those photographs made their way back to news desks," Harry said.

A group of photographers chased after the car Princess Diana was riding in just before it lost control inside a Paris tunnel the night of August 31, 1997. The driver, who also died in the crash, was under the influence of drugs and alcohol at the time.