An armed robbery took place at about 4 a.m. Monday on the Cambridge side of the Longfellow Bridge, police say. (Image: Google)

Two armed robberies have been reported the past week, police say.

The most recent was at about 4 a.m. Monday, on the Cambridge side of the Longfellow Bridge. A man said he was robbed of his wallet by a suspect claiming to have a gun. The victim described the suspect as a dark-skinned Hispanic man, 20 to 25 years of age, between 5 feet, 8 inches and 5 feet, 10 inches and wearing a turquoise zipper hoodie and yellow sneakers. The suspect fled toward Boston.

The earlier incident took place between 11:30 p.m. Friday and 1 a.m. Saturday, when a man was approached by a group of six or seven men and three or four women, all 20 to 25 years of age and black, who “went through his pockets.” The victim said they stole his wallet, passport and cellphone and showed a knife when he tried to get his passport back. The location of the robbery wasn’t given, but the Massachusetts Institute of Technology Police Department is investigating with Cambridge Police.

Neither victim was affiliated with the institute, police say.

Officials suggest these precautions for people walking at night:

• Do not wear earbuds, headphones or listen to music while walking alone.
• Walk with a friend or in a group when possible.
• Be aware of your surroundings at all times and trust your instincts.
• Walk with confidence on the street and at a good, steady pace. Keep your head up and observe your surroundings.
• If you feel you are being followed, show you are suspicious — turn to look at the person. This sends a clear message you will not be taken by surprise.
• Change directions. If someone is following you on foot, cross the street and vary your pace. If the person following you is in a car, turn and walk in the opposite direction.
• If approached, do not resist. The best course of action is to hand over money and whatever other belongings are demanded and try to disengage from a potentially dangerous situation as soon as possible. “Remember, things can always be replaced,” police said.
• Try to remember descriptive information about the robber to tell police.

This information was taken from a press release.