The fourth perpetrator, who was around 6'2" tall and weighed roughly 210 pounds, wore a red puffy jacket.
One of the robbers covered his face with a ski mask, and all four had their collars turned up, officers said.
Capt. Linda M. McCaul, who oversees HUPD's patrols, would not comment on any specific changes to patrols in light of Tuesday night's robberies.
"We're always evaluating where we need people," she said.
Police said they are not sure whether to expect the group to commit more crimes.
"We don't know if this was a random act, or something this group will plan to pursue," McNamara said.
River House administrators and University officials advised students to take safety precautions in the wake of the incidents.
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