MINNEAPOLIS (WCCO) — Minneapolis Police have issued a crime alert after a series of brazen robberies occurred within hours of each other near the University Of Minnesota campus.

On Monday at 9:15 p.m., and Augsburg student was assaulted and robbed in the area of Riverside Avenue and 22nd Avenue South. Police say the victim was walking on Riverside when three suspects knocked him to the ground, kicked him in the head and tried to pull his backpack away from him. The suspects then took a calculator and fled. The victim was slightly injured.

In the first attack, the suspects are described as three black males in their late teens or early-20s. They were all described as having light-builds, dark skin and possibly members of an African immigrant community.

Two hours later at around 11:15 p.m., a similar attack took place near 20th Avenue South 6th Street South. The victim was attacked and his wallet taken, but he wasn’t seriously injured. The suspect’s descriptions were similar to the first attack.

Then, at 1:30 a.m., two victims were robbed near Cedar Avenue and 3rd Street South. Five suspects physically confronted the two victims and took their iPhones before fleeing. Neither victim was injured.

Police are advising people to precautions while walking alone or in small groups. For more, check Minneapolis Police’s crime prevention resources.