"This is a safe campus, and the perception of crime is so low that people tend to leave their doors unlocked, " says Jim Kolesar, a Williams College spokesman.

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The university, which lies adjacent to the city of Boston, had requested people stay away from the building, but have since said the campus is safe and that the suspect is no longer present.

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The university later issued a statement to say the campus is now safe but urged students to "remain vigilant".

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"We're going to continue to do our jobs here on campus, which is to keep this campus and community safe, " she said.

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The Orange County Sheriff's bomb squad was on campus Monday examining the explosive devices, which have been made safe.

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The key to staying safe from those incidents isn't complicated, according to Bob Harkins, associate vice president for campus safety and security at Texas-Austin.

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"All students require safe environments to learn and reach their full potential, and Coach Rice's conduct has no place on a campus that is devoted to learning and fostering a sense of community, " it said.

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