They made contacts with family members of the victims, suspected to be held hostage in the creeks.
The victims, Mr. Kennedy Ucheagwu, Dr. Omololu, Bello and Mr. Esang, said to be landlords at Oshorun Heritage Estate, had gone for an aerobic section on Saturday when eight masked gunmen in military camouflage intercepted them, shooting sporadically.
While others managed to escape, the victims were grabbed and away in boats through the waterways.