Some similarities have been found in the glyphs between Rongorongo and Indus writing. As well, the direction of writing (boustrophedon) might be the same/similar to Indus. What do scholars say?
Ancient Indus questions answered by Dr. Asko Parpola, Professor at the University of Helsinki, Finland, and author of Deciphering the Indus Script and The Corpus of Indus Seals and Inscriptions. He has numerous articles on this website, and the essay Deciphering the Indus Script.