The interior minister, Bernard Cazeneuve -- whose account of police deployments on the night of July 14 celebrations has already faced questions -- has been the lightning rod for criticism over alleged security failures.
Having resisted calls for his resignation from the far right, who are strong in the Riviera city, the Socialist hit back at the "grave accusations" made by the policewoman yesterday, saying he would sue for defamation.
Sandra Bertin, who is in charge of Nice's system of security cameras, told the Journal du Dimanche newspaper she had been "harassed for an hour" by an unnamed interior ministry official on the phone after a "commissioner" came to see her the day after the attack.
She said she had been told to detail the presence of the local police at the Bastille Day fireworks event and also to report "that the national police had also been deployed at two points".
"He ordered me to put in (the report) the specific positions of the national police which I had not seen on the screen," she was quoted as saying.
On Thursday, the left-leaning Liberation daily reported that only one local police car was barring the entry to the pedestrianised seafront when Mohamed Lahouaiej Bouhlel forced his lorry onto the Promenade des Anglais, mowing down families.
Since the carnage 10 days ago -- the third major attack in France in 18 months -- Cazeneuve has also been locked in an escalating row with the right-wing leaders of the Riviera city over claims of slack security.
Local authorities claimed it amounted to "destruction of proof" but prosecutors, who already had a copy, said it was to stop "shocking" images of the events -- in which 350 people were also hurt -- leaking out.
Former Nice mayor Christian Estrosi, who now heads the regional administration, has also accused the government of lying over the number of police and soldiers protecting the crowds that night.
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