Angela Merkel says she is shocked by "mass murder in Nice" as she promised to stand by France's side in the fight against terrorism.
"All of us who have come together at the ASEM summit are united in our feeling of disbelief at the attack of mass murder in Nice," the German chancellor said on the sidelines of a major summit between Asian and European leaders in Mongolia.
"Germany stands in the fight against terrorism at France's side, united with many, many others.
"I am convinced that, despite all the difficulties, we shall win this fight."
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"