Intensifying sectarian and clan violence has presented new opportunities for jihadist groups across the Middle East and raised concerns among American intelligence and counterterrorism officials that militants aligned with Al Qaeda could establish a base in Syria capable of threatening Israel and Europe. The new signs of an energized but fragmented jihadist threat, stretching from Mali and Libya in the west to Yemen in the east, have complicated the narrative of a weakened Al Qaeda that President Obama offered in May in a landmark speech heralding the end of the war on terrorism. The leaders of the Senate and House intelligence committees, Senator Dianne Feinstein of California and Representative Mike Rogers of Michigan, raised warnings in an interview on CNN on Sunday when they said that Americans were “not safer” from terrorist attacks than in 2011. The concerns are based in part on messages relayed this year […]