The dice is attributed to India by some accounts. Some of the earliest archaeological evidence of oblong dice have been found in Harrapan sites such as Kalibangan, Lothal, Ropar, Alamgirpur, Desalpur and surrounding territories, some dating back to the third millennium BCE, which were used for gambling. The oblong or cubical dice (akṣa) is the precursor of the more primitive vibhīṣaka—small, hard nuts drawn randomly to obtain factors of a certain integer. Dicing is believed to have later spread westwards to Persia, influencing Persian board games. Early references to dicing can be found in the Ṛig Veda as well as the newer atharvaveda.