France's interior minister is suing a senior policewoman for claiming she was pressured to falsify her security report after the Nice truck attack.

Minister Bernard Cazeneuve has come under heavy fire for alleged security failures on the Promenade de Anglais where an ISIS terrorist killed 84 people on 14 July.

Yesterday policewoman Sandra Bertin, who is in charge of Nice's CCTV network, claimed she was told to write that national police were present even though she had not seen them.

France's interior minister Bernard Cazeneuve is suing a senior policewoman for claiming she was pressured to falsify her security report after the Nice truck attack

She said she had been 'harassed for an hour' by an unnamed interior ministry official on the phone after a ministry 'commissioner' came to see her the day after the attack.

She claims she was 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'.

'The national police were perhaps there, but I couldn't see them on the video,' Bertin told the Journal du Dimanche newspaper.

'He ordered me to put in (the report) the specific positions of the national police which I had not seen on the screen,' she added.

She also said that she was told to submit her report 'in modifiable form'.

Socialist minister Cazeneuve hit back at the 'grave accusations' made by the policewoman, saying he would sue for defamation.

Minister Bernard Cazeneuve (pictured with Theresa May) has come under heavy fire for alleged security failures on the Promenade de Anglais where an ISIS terrorist killed 84 people on 14 July

He insisted the officer sent to speak to Bertin was not sent by his interior ministry.

Cazeneuve said in a statement: 'It will be very useful if Madame Sandra Bertin could be questioned by the investigators and could give them the names and positions of the people she is accusing, the emails she is talking about and their contents,' .

In an attack on the Nice Mayor Christian Estrosi, who belongs to the centre-right opposition party and has claimed the promenade was insufficiently policed, Cazeneuve added: 'Unworthy accusations are part of the virulent polemic that certain elected representatives in Nice have wanted to encourage and feed every day since the terrible July 14 attack.'

Mohamad Bouhlel, right, drove his rented truck along the Promenade des Anglais killing 84 people

French police eventually were able to bring Bouhlel to a halt after firing dozens of bullets into the cab, pictured

Bertin also said that if more police were armed, the truck might have been stopped.

'It was going at 55mph without lights … It dodged the municipal police barrier. The team couldn't stop it.

'You can't burst the tyres of a 19-tonner with a revolver. Then other municipal police in plainclothes in the crowd were confronted with it,' she said.

'If they'd been armed like our national police colleagues have demanded, they could have stopped it. Finally the lorry came to the national police who shot and neutralised it.'