According to @IfeanyiCy, they shot the policeman, repeatedly, to get an easy access to their target. The police Orderly was, however, brave enough to challenge them even with his wounds. The awareness created and the combined firepower of the police officers attached to the bank, were enough to repel the gunmen.
The police officer later died and 3 other persons sustained varying degrees of injuries. The
body of the deceased officer, simply identified as Hussain Jamaiz, has been evacuated and taken to the morgue by the officers of Imo Police Command.