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Sydney Siege Shows How Lone-Wolf Attacks Add to Terrorism Threat

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The 16-hour siege in Sydney’s central business district that ended with the death of a gunman and two hostages is the latest in a recent series of lone-wolf incidents that are posing new challenges for security agencies.

Before the Lindt Chocolat Cafe was stormed by police just after 2 a.m. today, television images showed captives holding up a black flag with white Arabic lettering. Islamic State has urged Muslims worldwide to retaliate for allied attacks on the extremist group in Iraq and Syria. The prospect that individuals are responding to that call is making it harder for anti-terror agencies to act.