I have read about many instances of such attacks. There seems to be lot of hate crimes in Australia such as in 2009 alone
Crimes against Indian students in 2009 included:
* "David", a 21 year old Indian student, was beaten unconscious in the Melbourne suburb of Glenroy on 4 May 2009. Four men had surrounded him, the one from behind smashing a bottle over his head before continuing to punch and kick him.[11]
* An Indian student was assaulted and robbed by a gang on a train while traveling to his home in Werribee in Melbourne's western suburbs in May 2009. He said his attackers asked "Why the f--- did you come here?"[12]
* A 25 year old student was stabbed in the head with a screwdriver in May 2009 while he was partying with three other Indian students.[13]
* An Indian graduate living in the Sydney suburb of Harris Park, had a petrol bomb thrown through his bedroom window on 24 May 2009. He received burns to 30 percent of his body and the blaze was extinguished by his Indian housemates. One housemate said that they had no enemies and he did not know the reason for the attack. The housemate also said that the area was not safe, and that he knew neighbours who had been robbed.[14]
* A 25 year old Indian student was stabbed in the abdomen near Carnegie railway station in Melbourne on 25 May. One of his two attackers laughed during the assault.[15]
* A student was badly beaten by a group of fifteen people on Chapel Street, Prahran, Victoria on 30 May.[16]
* On 2 June, a 21 year old Indian student was slashed across the chest with a box-cutter knife in Frankston. The incident occurred a day after a Sikh temple in Shepparton was vandalised.[17]
* On 8 June, Indians were attacked in Harris Park, allegedly by a group of Lebanese men, which sparked a street protest.[18] The local police superintendent said there was no suggestion that these incidents were racially motivated.[19]
* On 8 June, a 23 year old man was beaten unconscious while walking home from the St Albans train station. In the suburb of Springvale, an Indian student's car was torched.[20]
* On 11 June, a 22 year old old Indian student was assaulted in Rundle Mall in Adelaide. The fight, which resulted in the student's nose being broken, began when the attacker struck at his turban.[21]
* On 13 June, a 24 year old man was attacked by three people in Melbourne as he was about to enter his car. He was punched directly in the face by one while another hit him over the head from behind rendering him unconscious. He reported that they stole his mobile phone, wallet and car keys.[22]
* On 15 June, a 20 year old man was attacked by two men as he was entering his car in Boronia. He claims the men slammed the car door on his hand, punched him in the head and stomach, then racially abused him, calling him a "----ing Indian c---". He also identified one man as white and one appearing to be of African descent.[23]
* On 29 June, a 22 year old Sikh man was attacked when a group of six teenagers tried to remove his turban and cut off his hair. Two of the attackers were later arrested by Victorian police.[24]
en.wikipedia.org...
Now if you know anything about Sikhs, even touching their turban is considered a grave insult and dont even talk about cutting the hair.
Earlier they seemed to random attacks but now it has emerged that many of them are racially motivated attacks.
There was also a huge protest few months ago by Indian students there
Thousands protest against Indian student attacks
Indian students protest in Australia
) 
