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

There appear to be many continuities [between the Indus and later historical cultures]. Agricultural and pastoral subsistence strategies continue, pottery manufacture does not change radically, many ornaments and luxury items continue to be produced using the same technology and styles . . . There is really no Dark Age isolating the protohistoric period from the historic period.

In the east, the ancient Saraswati (or Ghaggar-Hakra) river ran parallel to the Indus . . . Towards the end of the Indus Valley civilization, the ancient Saraswati had totally dried up and its original tributaries were captured by two other mighty rivers . . . The gradual drying up of the Saraswati river is an event documented both geologically as well as in the sacred Vedic and Brahmanical literature of ancient India . . . Many episodes of the Rig-Veda take place along the sacred Saraswati.

The significance of these similarities or dissimilarities should not be taken too seriously since the biological anthropologists themselves caution that this is only a tentative suggestion due to the small sample size of the Late Harappan burials. Generally speaking, the biological evidence does not support any hypothesis involving the movements of new populations into Harappa from outside the Indus Valley during the Harappan or Late Harappan periods.