The mother of the two brothers suspected of the Boston Marathon bombing has said she is "sure that (her) kids were not involved" in the blasts.
In a tearful press conference, Zubeidat Tsarnaev said she would have noticed if her sons had been planning such an attack, saying: "Any change, we should feel, I should feel it."
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The report also said that many graduates do not even see a 'earnings premium' from their years at university.
The country's counter-terrorism forces have regained control of the facility.
The commissioner of the Metropolitan Police has said he cannot promise the public an attack will not take place.