A truck ploughed into a crowd in Nice, killing at least 84 people and injuring many after the Bastille Day firework display.
The driver was shot dead after barrelling the truck two kilometres through the festive crowd on the palm-lined Promenade des Anglais, sending hundreds fleeing in terror and leaving the area strewn with bodies.
"Quantico" actress Priyanka wrote, "The world is turning so cruel... How do human beings do this to each other. My heart bleeds for the victims of the Nice attack #PeaceForNice."
Anushka called the incident "heartbreaking".
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"How many more times will we witness horrific attacks against humanity?cannot express the anger #NiceAttack."
"Another sad day for humanity. A helpless feeling. Prayers for the people of #France. Condolence #NiceAttack," Rai said.
Shahid wrote, "Shame shame shame. Inhuman and cowardly. #NiceAttack."
Madhuri Dixit-Nene said, "Deeply saddened by the loss of precious lives. My thoughts & prayers are with the bereaved families. #NiceAttack."
"An eye for an eye makes the whole world blind. Mindless. Sad. Only when every human life will be equally precious can it all stop #NiceAttack," actor Randeep Hooda tweeted.
"Was at this very #Nice promenade, on the phone with a friend who was hurt in Istanbul airport attack, 2 weeks ago. Now this? #PrayForNice," Boman Irani said.
Actor Siddharth tweeted, "Nothing to do but mourn. #NiceAttack".