Citing a U.S. government official it did not identify, CNN reported Friday the directive was contained in a memo distributed this week.
The official said the order, effectively immediately, is part of an effort to make sure national security officials are up-to-date in real time on student visa information.
There were reports this week Dias Kadyrbayev and Azamat Tazhayakov -- charged with offenses, including obstruction of justice, in the Boston Marathon bombing attack -- were in the United States on expired student visas.
Officials haven't linked either of the two men -- foreign exchange students from Kazakhstan at the University of Massachusetts-Dartmouth, where their friend, bombing suspect Dzhokhar Tsarnaev, was enrolled -- to the Boston attack but say they hope they can learn more about the suspects' movements before and after the marathon, a source told CNN.
"These guys are not being cut loose immediately, and there's a reason why," the federal law enforcement source said.
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