Brendan Cox, widower of MP Jo Cox whose funeral was due to take place on Friday, tweeted:
Jo wld ask us not 2 fight hate with hate but draw together 2 drain the swamp that extremism breeds in.Thinking of all victims of hatred 2day
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"