Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – The hostage standoff in Sydney has ended but it is yet another example of what keeps law enforcement officials awake at night: the "lone-wolf" scenario.
Sympathizers of an extremist ideology become radicalized and take it upon themselves to carry out attacks in the name of jihad.
CNN’s Jim Sciutto reports on the challenges intelligence services face in the fight to guard against would-be "lone-wolf" attackers.