Gandhi, who was accompanied by party Vice President Rahul Gandhi, told reporters here after the meeting with Singh, that they are "shocked, astounded and pained by the attack on our colleagues."
She condemned the Maoist attack on the Congress Parivartan Yatra that led to the death of party leader Mahendra Karma.
The UPA Chairperson said the attack on ordinary party workers is "despicable".
"Naturally we are devastated... It is despicable that ordinary people engaged in political activity were attacked," she said.
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Gandhi also expressed concern over the condition of senior Congress leader V C Shukla, who was injured in the attack.
"Shuklaji has been hit by a bullet in the stomach area," she said.
Gandhi said the Prime Minister has spoken to Chhattisgarh Chief Minister two hours back who had said he will get back but had still not called.
Gandhi said all authorities concerned have been asked to render all support.