As reports emerged that Maoist politburo member Katakam Sudarshan alias Anand was the mastermind behind the attack, the National Investigation Agency team flew to Raipur on way to Darbha in Bastar district.
The NIA team, headed by Inspector General of Police Sanjiv Kumar Singh, will investigate the circumstances leading to the attack and find out those Maoists who were involved in it, official sources said.
The central investigators have taken over the case registered in Darbha police station under various sections of IPC, Arms Act, Explosive Act and Unlawful Activities (Prevention) Act.
27 people including PCC chief Nand Kumar Patel, his son Dinesh, Congress leader Mahendra Karma were killed and 32 others, including former Union Minister V C Shukla, were injured in Saturday's incident.
Minister of State for Home RPN Singh said investigation will be conducted to find out possible lapses on the part of the central forces or the state government and action will be taken if anyone is found guilty.
"Any lapse on the part of central forces or the state government, buck will have to be stopped somewhere. We have to take action," he said.