In a post for the Spectator, she wrote: "I am now in the city, having watched the fireworks in the crowd on La Promenade des Anglais where the attack took place, and we have all been told to stay indoors".
"The Los Angeles County Sheriff's Department employs thousands of uniformed deputy sheriffs who are on-duty 24 hours a day, seven days a week, patrolling and protecting the many diverse and varying communities we serve ...", officials said.
"But then, from the direction of the truck, I started hearing screaming and then people started running".
French President Francois Hollande said that the incident had "all the elements to be called a terrorist attack".
The council reaffirmed that terrorism constitutes one of the most serious threats to world peace and security.
"There was carnage on the road", Bouhlel said, "bodies everywhere".
Flags were lowered to half-staff in Nice and in Paris and the state of emergency imposed after the November bloodshed was extended another three months. "That... motivated the attack", he said. "I got extremely frightened and ran away from the promenade", she said. "Heard noises, cries that I will never forget".
"Some people were lying on the streets dead and people were running over the bodies".
US President Barack Obama released a statement condemning "what appears to be a horrific terrorist attack".
Tusk tweeted a photograph of himself and other European and Asian leaders standing in tribute to the Nice victims at the Asia-Europe meeting in Mongolia.
France's Interior Minister Bernard Cazeneuve said 80 people were killed, including children, and 18 were in critical condition, and the Paris prosecutor's office announced an investigation for "murder, attempted murder in an organized group linked to a terrorist enterprise".
It was not immediately clear who would have been behind an attack, but France has recently seen a spate of dramatic assaults by jihadist groups, including the Islamic State that straddles Iraq and Syria. It was due to expire on July 26.