Squad cars from Harvard, Cambridge and Boston flooded the area in the minutes following the hold-ups.
The robberies were so close in time and place that police are assuming the crimes are related.
"We presume it was the same group," McNamara said. "They walked from one robbery to another."
The victims described the robbers as four black males in their teens. All stood around 6 feet tall. Three wore black puffy jackets, and the fourth--who brandished a small handgun--wore a red puffy jacket and had a scar on his cheek. One of the robbers covered his face with a ski mask, and all four had their collars turned up.
Given that the description contained few details and that the suspects were camouflaged, McNamara said she thought it would be difficult for the victims to identify the culprits.
In the hours following the robberies, Harvard administrators scrambled to notify the campus.
Several residential advisors issued advisories to their entryways. At least one House Master, Howard Georgi of Leverett, wrote an e-mail message to all the residents of his House.
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