"I am deeply shocked and anguished to learn about the cowardly attack on Amarnath Yatris in Anantnag district of Jammu and Kashmir, in which a number of innocent pilgrims lost their lives and several others were injured," he said in his message to the governor.
Mukherjee described the "senseless acts of terrorism" targeting innocent lives, which "deserve to be universally condemned", as an "attack on the democratic values of the society".
The president's message to the governor was released to the media here by a spokesman of the state government.
He, however, did not mention when did Mukherjee sent the message to Vohra.
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Seven pilgrims, including six women, were killed and 21 injured when their bus came under terrorists' gunfire in south Kashmir's Anantnag district in the evening of July 10.
"I call upon the state government and all the agencies concerned to ensure that the guilty are brought to justice and law-and-order is maintained in the state," read the president's message.
"Please convey my heartfelt condolences to the families of the deceased. I also wish the injured persons a speedy recovery," he said.