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This Article Black African genetic contribution to the population of the European continent explains how genetic markers that are common among Negriods can be found at low frequencies in parts of the European Continent:

Y-DNA
Haplogroups A, B and certain subclades of E (esp. E3A) are considered to be characteristic of sub-Saharan populations These haplotypes are found at frequencies of less than 1% in every part of Europe studied. Although Haplogroups A and B are undeniable considered to Sub-Saharan haplogroup E is thought to represent a migration from Asia to Africa .Interestingly haplogroup E is closer related to Eurasian y-dna haplogroups then it is to sub-saharan african y-dna haplogroups with both E and the eurasian y-chromosomes being desendents of CT while the sub-saharan y-dna haplogroups are not.

Mtdna
Mtdna haplogroup (L) which is the only mtDNA haplogroup that is considered to be sub-saharan, is much more common in Europe then all of the sub-Saharan y-dna haplogroups combined . Even so it is quite rare in Europe: Where it is found at a frequency of less than 1% in all nations in Europe that where studied except for Portugal where a few percent of people have it.