Nice attack: Eight new suspects arrested in relation to Isis supporter's Bastille Day lorry rampage

The attack on 14 July killed 86 people, with the driver being shot dead by police

A tribute is laid on the ground where a person was killed on the Promenade des Anglais, Nice (Getty)

French police have arrested eight new suspects in connection with the Nice attack.

The Paris prosecutors' office said they are all linked to Mohamed Lahouaiej-Bouhlel, the Tunisian Isis supporter who carried out the massacre.

He drove a lorry into crowds of people celebrating Bastille Day in the Riviera city on 14 July, killing 84 people and injuring more than 400 others before being shot dead. Two more victims have subsequently died in hospital.

The eight men, who are Tunisian and French, were arrested on Monday in France's Alpes-Maritimes region and remain in custody.

The arrests came as French and Belgian prosecutors continue investigations into the Paris and Brussels attacks, which were carried out by linked cells of Isis militants.

Belgium's federal prosecutor extended the custody of three suspects last week - Yasin A, Rabah M and Abderrahmane A, who were all arrested in connection with a foiled terror plot by Reda Kriket.

Both countries have been on a high state of alert since the 13 November attacks, were Isis militants armed with Kalashnikovs and suicide vests killed 130 people at Paris landmarks, restaurants and the Bataclan concert hall.

The massacres were followed by the bombings at Brussels Airport and Maalbeek Metro station, killing 32 people.

Isis has also claimed responsibility for a series of "lone wolf" attacks carried out by supporters, including the murder of a Catholic priest in Nice and attempted suicide bombing in Germany.

Lahouaiej-Bouhlel, who carried out the Nice attack, was born in Tunisia and moved to France in 2005, where he worked as a lorry driver.

He was not on France's "Fiche S" list of suspected extremists but was known to authorities for traffic offences and assaults.

Shortly before his attack, relatives said Lahouaiej-Bouhlel had been contacted by an Algerian Isis member and watched the group's gory propaganda videos.