On January 18 an anonymous caller reported a bomb in Building 10, but said nothing else. A police sweep found nothing. A few days later Buildings 6 and 8 were evacuated when an employee reported a briefcase had been left unattended for more than an hour at the end of the Infinite Corridor. The Cambridge bomb expert opened the case with firefighters standing by. The case, of the type carried by technicians who service copying machines or computers, was empty.
Police believe it had been stolen elsewhere and emptied of tools.
Although news accounts about the likelihood of terrorist attacks have raised concerns on campus to some extent, the chief said, she has received only about a half-dozen phone calls and one letter expressing apprehension.