The identities of the assailants remain unknown and the Nigerian Army has not released an official statement regarding the incident, as details are still emerging.
Earlier, the separatist group declared a May 30 sit-at-home across the five Southeast states, honoring Igbo people killed during the civil war of 1967-1970 with no business activities or movements.
Reacting, the Enugu State government rejected the sit-at-home order called by IPOB to mark the day, saying it had put security agencies on red alert to resist any attempt at the breaking of law and order.
IPOB had last week, in a statement by its spokesman, Emma Powerful, advised the West African Examination Council to shift WASSCE papers slated for May 30.
It similarly advised the Nnamdi Azikiwe University in Anambra State to shift its convocation slated for the same date.