The suspect was arrested along the Ado-Odo-Owode road in Ogun State.
The Ogun Police Command said on Thursday that it arrested a 38-year-old man, Adelani Ayomide, for being in possession of a case containing 18 human skulls.
A statement by the command's spokesperson, Muyiwa Adejobi, issued in Abeokuta said Mr. Ayomide was arrested on Thursday along the Ado-Odo-Owode road at about 6.48 a.m. throughout a routine police stop-and-search operation.