A car has been damaged and daubed with offensive comments, threatening letters have been sent and women have been abused in the street.

A backlash of hate crimes against the Muslim community after the police raids last week has also sparked a rash of social media comments such as "this is how they should deal with them", "behead them all", "give them a taste of their own medicine for a change" and "we just need to blow up parramatta n bankstown".

One of the founders of the Australian Arabic Council and human rights activist Joseph Wakim said "everyone should remember that no faith tells you to harm innocent people".

"It is not open season on Muslims," Mr Wakim said. "It is not OK to go Muslim-bashing.