According to British newspapers, there are no “Arabs” in Great Britain, only “Asians.” Odds are good that the next report will describe the subjects as “five Asians.” So I’m thinking that it is likely that the five men are a Buddhist, a Hindu, a Sikh, a Shintoist and a Confucian.
That’s because most terror-types in the UK are Pakis and not Arabs so the term Asian covers them all.