Israel's big clampdown amid concerns over Islamic State recruiting Arabs , 1 / 5th of the population

In March , a convicted sympathiser went on a stabbing & car - ramming rampage ( 4 killed ) . Days later , cops were killed & others wounded in an attack claimed by the jihadist group renewed long - standing concern about I.S. efforts to recruit Arab citizens . Pertinent to note , Arab citizens account for roughly a fifth of the Israeli population .