From early historical times forward we know that horses have been regularly imported to South Asia. We also know the Indus had a long tradition of tr… - Bridget Allchin

Archreological evidence ... both in Iran and India and Pakistan...indeed it almost always lacks any clear hallmarks to establish its originators as Indo-Europeans.

Such "ritual hearths" are reported from the beginning of the Harappan period itself. It has been suggested that they may have been fire altars , evidence of domestic, popular and civic fire-cults of the Indo-Iranians, which are de- scribed in detail in the later Vedic literature. It may then be an indication of culture contact between an early group of Indo-Aryans and the population of the still-flourishing Indus civilization.

The orientation of port-holes and entrances on the cist graves is frequently towards the south. [...] This demands comparison with later Indian tradition where south is the quarter of Yama. Among the grave goods, iron is almost universal, and the occasional iron spears and tridents (trisulas) suggest an association with the god Siva. The discovery in one grave of a trident with a wrought-iron buffalo fixed to the shaft is likewise suggestive, for the buffalo is also associated with Yama, and the buffalo demon was slain by the goddess Durgà, consort of Siva, with a trident. [...] The picture which we obtain from this evidence, slight as it is, is suggestive of some form of worship of Siva.