 In South Asia, R1a1a has often been observed with high frequency in a number of demographic groups, reaching over 70% in West Bengal Brahmins in India and among the Mohani tribe in Sindh province in Pakistan.Behar suggested a founding event, probably involving one or very few European men, occurring at a time close to the initial formation and settlement of the Ashkenazi community as a possible explanation.As Nebel, Behar and Goldstein speculate, "although neither the NRY haplogroup composition of the majority of Ashkenazi Jews nor the microsatellite haplotype composition of the R1a1 haplogroup within Ashkenazi Levites is consistent with a major Khazar or other European origin, as has been speculated by some authors (Baron 1957; Dunlop 1967; Ben-Sasson 1976; Keys 1999), one cannot rule out the important contribution of a single or a few founders among contemporary Ashkenazi Levites."