STR allele proportions vary sharply between ethnic populations. These variations reflect ancestral gene pools. Method estimates profile frequency in five British ethnic groups: Caucasian, Afro-Caribbean, Indian sub-continental, Southeast Asian, Middle Easterners. Profiles enable ethnic inference for unknown offenders. Previous studies confirm ethnic differences in STR alleles. Statistical methods assign profiles to ethnic groups based on allele proportions. No match on NDNAD prompts ethnicity intel for investigations.