In a letter to Putin, Singh termed the attacks as "unconscionable" crime against humanity and said he was "outraged and pained" to know about them.
"On behalf of people and Government of India and on my personal behalf, please accept our deepest condolences on the loss of lives and injuries in these ghastly attacks. Our prayers go out to families of all the victims," Singh said in the letter.
At least 14 people were killed today when a suicide bomber blew himself up on a trolleybus in Volgograd.
Putin has already ordered stepped up security across the country.
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