What is a Muslim's duty towards a person, Muslim or non-Muslim, whether unveiled or committed to the hijab, who is verbally or physically harassed?

This act is forbidden by Islamic law, whether committed with a Muslim or a non-Muslim woman. Whoever witnesses this reprehensible act must condemn it to the best of their ability, whether by their hand, tongue, or heart, while ensuring that this does not lead to a greater harm. If the perpetrator is not deterred except by punishment, then the competent authorities should be informed to take appropriate action.