Indian Olympic Association (IOA) president PT Usha on Thursday said she is "deeply concerned and disturbed" by the sexual harassment allegations by renowned wrestlers against Wrestling Federation of India (WFI) president Brij Bhushan Sharan Singh, saying the national Olympic body will do everything possible to safeguard the interest of the country's women athletes. Celebrated Indian wrestlers, including Olympic medallist Bajrang Punia and Sakshi Malik besides Vinesh Phogat and others are staging a sit-in protest for the last two days at Jantar Mantar here against the WFI president, accusing him of sexual exploitation and intimidation and have demanded that the federation be disbanded.