A witness said the invaders, on several motorcycles, opened fire on villagers without any provocation, killing over 14 people in different locations.
Mr Adejobi said investigation revealed that the group had been involved in several high-profile crimes.
According to him, two security agents, not soldiers, were killed in action.
A cross-section of traders in Abia and Imo says the two-day sit-at-home crippled their businesses and caused them huge financial losses.
Security experts have advised the federal government on how to curb worsening insecurity in Nigeria.
Mr Buba said the military would be fierce in its reprisal and would bring military pressure on IPOB to ensure their total defeat.
“One of the IPOB/ESN commanders, Tochukwu, Aka Ojoto, in charge of Ihietukwa Command, despite many charms on his body, was neutralised,” he said.
“The bravery and dedication of our troops in the face of danger are testimonies of their unwavering commitment to protecting the people and communities,” said the army.
“Other items recovered from the terrorists’ hideout include a pair of proscribed Biafran uniforms, one solar panel and one CCTV camera,” said the army.
“They were also planning to carry out attacks on our troops.”
