Police are probing other possible angles too, Director General of Police Maithlisharan Gupt said.
The accused has been identified as Vineet Kumar (55), a native of Beldari Tola, Gaya district, Bihar and was living in Jabalpur under a false name 'Praveen Awasthi', he said.
The police team zeroed in on Kumar after questioning his brother-in-law in Patna.
Kumar had also obtained a fake voter identity card in the name of Praveen Awasthi, the DGP said.
He further told police that his brother-in-law Vijay Kumar Singh and sister Kamla Kumari had grabbed his entire property and framed him up in several false cases.
"To settle the score, he placed a packet containing a bomb, a battery, a wire and a switch in a sleeper coach of the Gondwana Express alongwith some papers leading to his brother-in-law and sister," the DGP said.
