French Interior Minister Bernard Cazeneuve has said he will sue for libel after a senior police officer said she was harassed to change her report on the Nice terror attack.
The policewoman, Sandra Bertin, was in charge of security cameras.
She said she had been told to report the presence of national police units, although she had not seen them.
More than 80 people diedwhen a lorry struck crowds celebrating Bastille Day on 14 July.
So-called Islamic State (IS) said it was behind the attack, which was carried out by a Tunisianman, Mohamed Lahouaiej-Bouhlel.