In a letter to French President Francois Hollande, Mukherjee conveyed condolences on the loss oflives in the heinous act of terror last evening in Nice and said Indian stands beside people of France with solidarity and sympathy.
Modi said the "mindless act of violence" was appalling and India shares the pain and stands firmly with France in this hour of "immense sadness".
"Appalled by the horrific attack in Nice. I strongly condemn such mindless acts of violence. My thoughts are with the families of deceased," the Prime Minister tweeted.
Congress President Sonia Gandhi said that the terrorist attack on a crowd celebrating Bastille Day in Nice "reflects deep resentment to peace and democratic values".
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The President, who is in Darjeeling on an official visit, said, "I am deeply pained to learn that France is once again afflicted by a major tragedy caused by a heinous act of terror last evening.
"The pre-meditated massacre of innocent people as they were participating in Bastille Day celebrations - including, sadly, many children, is an unspeakable crime."
"India stands shoulder to shoulder with the people and government of France as it responds to this attack.
"We will strengthen our cooperation with France and other countries in the fight against terrorism," Mukherjee said in a series of tweets.