Frank Mba, Spokesman of the Nigeria Police Force, made this known in a statement on Tuesday in Abuja.
He said the IGP gave the order following report that covered number plates might be used to commit election related offences before, during and after the Governorship and House of Assembly Elections slated for Saturday.
He also warned that covering of vehicle number plates was a clear breach of road traffic law and others laws of the land.
The IGP said such practices could also impact negatively on national security and heighten criminal activities.
IGP Adamu also directed all Assistant Inspectors General of Police (AIGs) and Commissioners of Police (CPs) in the zonal and state commands to strictly enforce the order.
He warned further that any security personnel found escorting their principals with an unmarked vehicle or covered vehicle number plates, would be arrested and dealt with accordingly.