Somerville city officials sent out a warning over the weekend to be wary of late-night robberies.
According to an email sent by Jackie Rossetti, a city spokeswoman, the Somerville and Tufts University police departments report that over the last three weeks, three late-night robberies and assaults have occurred in the area between Davis Square and Tufts University.
The most recent robbery was early Friday.
"Residents are encouraged to remain vigilant and aware of their surroundings, particularly when walking at night, and, if possible, should not walk alone after dark," said Rossetti.
The attacks were thought to be unrelated, Rossetti said, and in one of the incidents three suspects were arrested.
Regardless, city officials offered these tips for residents: