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The FBI’s near-miss investigation of Orlando nightclub shooter Omar Mateen reflects a US counterterror effort swamped by potential targets and struggling to separate lethal Islamic State recruits from hotheads venting their spleen.
After dropping its 2013 scrutiny of Mateen, the bureau is under fire for not doing more to prevent the worst mass shooting in modern US history. Yet on other occasions in recent months, the FBI has been criticised for its handling of domestic terror probes, including the use of controversial sting operations.