There is no archaeological or biological evidence for invasions or mass migrations into the Indus Valley between the end of the Harappan Phase, about… - Jonathan Mark Kenoyer

Although the overall socioeconomic organization changed, continuities in technology, subsistence practices, settlement organization, and some regional symbols show that the indigenous population was not displaced by hordes of Indo-Aryan speaking people. . . . For many years, the "invasions" or "migrations" of these Indo-Aryan-speaking Vedic/ Aryan tribes explained the decline of the Indus civilization and the second rise of urbanization. . . . This was based on simplistic models of culture change and an uncritical reading of Vedic texts. Current evidence does not support a pre- or proto-historic Indo-Aryan invasion of southern Asia. . . . Instead, there was an overlap between Lite Harappan and post-Harappan communities . . . with no biological evidence for major new populations.

More surveys have revealed large, post-Harappan settlements in the Indus region after the major Indus centres were abandoned. . . . Research . . . is beginning to demonstrate that there really is no Dark Age isolating the protohistoric from the historic period.

The dating of glass in the Indus Valley and northern India, between 1900 and 1700 BC suggests that this industry was becoming common in all three regions at about the same time. ...No analysis of the recently discovered Late Harappan glass has been undertaken, but the styles of beads and the presence of a highly developed faience industry suggests that the Indus glass technology was an indigenous development.