""Asians" (often Brit press code for people of Pakistani extraction)""
Pakistani, Indian or Bangladeshi normally. It's not 'press code' though, it's common usage.
Well, the press is supposed to prize accuracy. I don't know whether or not non-Muslim "Indians" (Sikhs, Hindus, whatever) do a lot of street brawling, but if they do I've never read about it. If that is the case then simply referring to "Asians" omits information the reader may find useful.