About 100 students poured onto Mt. Auburn St. late Saturday night as a false alarm sounded from a fire box on the fifth floor of Claverly Hall.
Fire trucks from the Cambridge and Taylor Square departments arrived on the scene at 11:20 but found no fire.
Claverly security guard Bill Carroll said yesterday there was a large number of students at a party on the fifth floor, adding that he believes one of the students pulled the alarm "as a joke."
Carroll said "Mostly all Harvard students" were in the building at the time of the alarm.
Neither Cambridge fire officials nor University police spokesmen were available for comment on the false alarm.
In a similar incident, a false alarm Sunday morning roused students in Winthrop House from their beds at about 4 a.m.
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