I don't know about Austria, but there've been several despicable attacks on Roma beggars/homeless (they're typically both) lately in Sweden.
We had one instance last year of a beggar's camped getting attacked with a molotov cocktail:
http://www.aftonbladet.se/nyheter/article21768684.ab
Then there was the case of a machete weilding man who slashed two beggar's and tried to burn them alive in their tents:
http://www.aftonbladet.se/nyheter/article21228849.ab
In yet another instance, four sheds housing beggars caught fire and one man eventually ended up actually dying from complications due to smoke inhalation. Police insist that it was an accident, but it's kinda hard not speculate considering how the four sheds went up at the same time and when online hate groups had proposed an attack just like it.
http://sverigesradio.se/sida/avsnitt/430201?programid=3052
The sad truth is that no one cares about Roma. There are other instances of attacks in broad daylight (including one case I remember where a beggar had a bucket of water poured on them in sub-zero temperatures, which could kill someone) but very, very few lead to prosecutions.
Maybe us Swedes are simply more barbaric than the rest of Europe, but there's also the possibility that attacks on beggars typically never get reported, or have the same reach, as this instance.