The apparently sudden appearance of Indus-type seals, pottery and other implements around 2000 BCE in the Arabian Gulf, just before the Indus cities and culture seems to have gone into decline, is a great mystery.
A must-read paper. Dennys Frenez classifies and nicely illustrates recent finds in the Oman Peninsula connecting it to the Indus civilization in multiple ways.
An interesting article in which the author discusses the existence of Indus-type seals in the Gulf and Mesopotamian regions, their relationship to trade and other civilizations in the area, including the Central Asian Bronze Age civilization now better known as the BMAC (Bactrio-Margiana Archaeological Complex). After carefully reviewing the evidence for Indus settlers in ancient Mesopotamia, and their use Indus-type seals whose signs are ordered in ways not found within the Indus region proper, she discusses the relationships they may still have had with Indus peoples back home and the role of different kinds of writing in this relationship.
Perhaps some of the best clues to deciphering Indus seals may lie in the Arabian Gulf, where inscribed seals seem to have arrived and taken root just as they disappeared in Indus cities around 2000 BCE. "The Harappan sealing tradition, however, continued in Dilmun long after it had vanished from the Indian subcontinent and lived a vibrant life of its own," writes Steffen Laursen.