CHICAGO (CBS) — Another student was robbed this week near the University of Illinois at Chicago campus, prompting campus police to issue an alert.

The robbery happened around 9:30 p.m. Thursday. The student was robbed while walking east on Polk Street from Oakley Boulevard, down a block flanked by Washington Irving Elementary School on one side and residential buildings on the other.

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A man riding a bicycle pulled up behind the woman, struck her in the head, and demanded money. He took the student’s backpack and rode off southbound on Oakley.

The victim believes the offender was armed but did not see the weapon. She suffered minor injuries, but refused medical treatment, police said.

The offender is described as an African-American man a dark complexion, 20 to 30 years old, about 150 pounds and 5 feet 8 inches tall, with brown eyes, short black hair, and wearing a dark blue hooded sweatshirt.

This is the second robbery of a UIC student near campus in barely the past week. On Thursday, Sept. 6, around 9:18 p.m., a student was robbed in the 500 block of South Oakley Boulevard, around three blocks away from the latest crime scene.

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That victim, also a female UIC student, was walking north from Harrison Street when she was approached by a lone robber, who took out a handgun and demanded her cell phone and messenger bag. The victim was not injured, and the bag was recovered by police a short distance away.

UIC also saw a spate of student robberies earlier this year, some of them close to the main campus.

On a Tuesday evening in April, a male student was robbed and hit in the head in the 800 block of South Green Street in Greektown. About four days later, another male student was robbed in the 1400 block of South Loomis Street by a group of men, one of whom put a gun to his head.

Anyone with information on either of the latest robberies should call UIC Police at (312) 996-2830.

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The Sun-Times Media Wire contributed to this report.