Let the Israeli police investigate this crime, before drawing any conclusions. Their spokesman says that the exact nature of events is still to be determined. The existing witness statements have some flaws and points of immprobability. No description of the two attackers has been circulated.
There was a crime, some months back, where a little Indian boy died in Melbourne Australia. The international media took it up - calling Australians out - suggesting he was the victim of a hate crime. Eventually, an Indian man who lived in that same household, a friend of the parents was arrested.
If you read the posted article and others on this crime, you'll find that the surviving woman has described the perps as Arabs who spoke Arabic.