Cricket Australia launched an investigation with New South Wales Police after Siraj complained of hearing racist slurs while fielding near the boundary rope during the third Test at Sydney.
Video footage from the stump camera of Smith dragging his boot across the crease on a tense final day of the match went viral on social media and some former players accused him of gamesmanship at best, cheating at worst.
Wicketkeeper Paine at one stage called Ashwin a "dickhead" as the spinner and Hanuma Vihari batted through the last three hours of the match to earn a draw at Sydney Cricket Ground and keep the series tied at 1-1.
A group of Australian spectators were ejected from the Sydney Cricket Ground during the fourth day of the third Test on Sunday.
Openers Shubman Gill (31) and Rohit Sharma (52) were winkled out by the Australian pace attack in the final session, leaving Cheteshwar Pujara and skipper Ajinkya Rahane to continue the fight on the final day.
Play was halted for a few minutes on the fourth day of the third Test between India and Australia after the visiting players complained of abuse from the crowd at the Sydney Cricket Ground.
However, there is some good news for India as wicketkeeper-batsman Rishabh Pant's elbow injury is not serious and he will probably be available when India bat to save the ongoing Sydney Test.
According to BCCI sources, Siraj was allegedly referred to as a "monkey" by a drunk spectator in one of stands at the Sydney Cricket Ground.
Pat Cummins took 4/29 as Australia rolled through the Indian batting order on a sunny afternoon at the Sydney Cricket Ground to dismiss the tourists for 244.
The Indian all-rounder produced a moment of sheer brilliance to prove why he is considered one of the best fielders in contemporary cricket.