Cricket Australia and police investigate India's claims of fan abuse at SCG Test

• Allegations of abuse overshadow two days of third Test
• Ashwin calls on authorities to use iron fist' approach

India veteran Ravichandran Ashwin claims he has been the victim of abuse from Sydney crowds for almost a decade, as Australia's acting prime minister supported Cricket Australia and the NSW police for launching investigations into allegations of a racial slur during the third Test.

Crowd incidents overshadowed both days three and four at the SCG.