The call was made following the killing of two young men at the popular Waterlines junction of Port-Harcourt, after gunmen stormed the area on Wednesday evening (yesterday).
The victims were reportedly shot dead in cold blood and abandoned by the gunmen who fled immediately after the attack.
This latest killing is coming weeks after gunmen on a power bike killed at least two persons in the same area.
A witness said the gunmen were shooting sporadically as soon as they drove into the crowded Waterlines junction.
He said one person was shot dead, while the second person, who sustained serious bullet injuries, died as he was being taken to the hospital.