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WASHINGTON — U.S. intelligence officials are concerned that Al-Qaeda is trying to develop a new and improved bomb that could go undetected through airport security.

There is no indication that such a bomb has been created or that there’s a specific threat to the U.S., but the Obama administration on Wednesday called for tighter security measures at foreign airports that have direct flights to the U.S.

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Transport Canada was taking “additional precautionary measures,” in light of the reports on Al-Qaeda, a spokesperson said via email.

“The department will continue to monitor and assess the situation closely, and make adjustments when necessary,” the spokesperson said, adding that no further details on the new Canadian measures could be released due to “security reasons.”

American intelligence has picked up indications that bomb makers from Yemen-based Al-Qaeda in the Arabian Peninsula have traveled to Syria to link up with the Al-Qaeda affiliate there, known as the Nusra Front, according to a counterterrorism official who spoke on condition of anonymity because he was not authorized to speak publicly about the matter by name. The enhanced security measures have been in the works for the past month, he said.