Police believe all of the Matthews burglaries are related, and have stepped up patrols in the Yard, as the robber appears to be getting more brazen.
The Crimson has learned that, for the first time in recent memory, HUPD is using undercover officers to patrol the Yard.
Just the same, proctors in Matthews are warning their students to keep their doors locked at all times, even when students are in their room.
It's a message that many students are taking to heart. "We're prisoners in our rooms," said one.
Lamas, who grew up in Cambridge, said, "I've never had a problem with crime here. I certainly didn't expect to have a problem when I came to Harvard."
Students are growing weary of the incidents, and are frustrated with the police's efforts.
"If the cops can't stop [the robberies], I don't know what the next step is," said Helen B. Stevens '03 .