"We can infer from the final chargesheet filed by NIA that the agency did not conduct proper investigation into the case. The NIA report is disappointing," said Chhattisgarh state unit Congress president Bhupesh Baghel.
Addressing reporters here, Baghel alleged NIA did not question any officers, including Darbha police station incharge, Bastar SP, IG, ADGP, during the course of investigation.
"The NIA report is also silent on the fact that state government had complete information beforehand about the 'Parivartan Yatra'," he said.
"The state government had said in Legislative Assembly that 550 police personnel were accompanying the rally. If that is the case then why did they not retaliate during the attack. NIA report also keeps mum on this point," Baghel said.
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He said the report failed to clarify why the ultras called out their victims by names and then shot them dead.
The top state Congress leadership was almost wiped out in the ambush in Jheeram Ghati in Bastar district on May 25, 2013 in which 27 people were killed and 33 others injured.
The demand for CBI probe had been raised by the kin of the victims after the attack.