Terror threats requiring the closure of numerous U.S. embassies suggest that the "war on terror" isn't going as smoothly as President Barack Obama has claimed, Republicans say. While the U.S. has made significant progress in dismantling al-Qaeda, security experts say the terror group has demonstrated an ability to regenerate and regroup. "The obituary for al-Qaeda has been proclaimed year in and year out ever since 2001. It’s proven premature in every case,” said Bruce Riedel, director of the Brookings Institution’s Intelligence Project.

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