A man caught up in the Nice lorry attack lost six family members in the atrocity.
Christophe Lyon lost his wife Veronique, 55, his mother Gisele, 63, and his father Germain, 68.
Veronique's 28-year-old son Michael Pellegrini was also killed along with his grandparents Francois and Christiane Locatelli, aged 82 and 78 respectively.
Mr Lyon is said to be too traumatised to speak following the attack which killed 84 people including 10 children.
Some 52 people - including 30 children - are still in hospital.
French Prime Minister Manuel Valls faced boos and calls to resign as he laid a wreath for the 84 people killed in the lorry attack in Nice.
Hours later Mohamed Lahouaiej Bouhlel drove a 19-tonne lorry down the promenade killing 84 people and injuring 200 more.
France's prime minister stated on Sunday he believed the man behind the Nice lorry attack was radicalised "very quickly"