They were apprehended after the attack on Omuma and Njaba police facilities.
Emmanuel Nnaji, a native of Awala in Ideato South Local Government Area, who earlier sustained bullet wounds, was first nabbed.
Nnaji mentioned a hotel in Orlu where the ESN gather to plan their assault against government facilities.
The head of a young man was severed and placed on the road close to the premises.
The suspect disclosed that the hotel owner has been accommodating and assisting them financially.
Twenty-six suspects – 19 males and seven females – were arrested after he led security operatives to the location.
One AK-47 rifle with two magazines loaded with 55 rounds of live ammunition, 5 pump action guns, 2 double barrel cut to size guns, 4 double barrel locally-made pistols were recovered.
Others were 3 single barrel locally made pistols, 8 live cartridges, charms, 2 bags of weeds suspected to be Indian hemp, Biafran flag and beret, ESN cap, four pairs of army camouflage uniforms and a camouflage bag.
Imo Police Command spokesman, CSP Michael Abbatam confirmed that investigation was ongoing.