The two most recent incidents were reported Tuesday and involve two men who allegedly made rude comments to women, and in one case, grabbed a woman's arm after making disparaging remarks.
The first incident was at about 5 p.m. in the 1900 block of Sheridan Road. The second occurred at about 6:10 p.m. in the 1700 block of Chicago Avenue.
This follows a safety alert that was issued last week after several incidents of women being attacked while walking alone.
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In total, there have been five incidents in the last two and a half weeks.
Senior Ryan Albelda said her sorority and others created group chats to help members organize walking together.
"I've seen more people walking together and that's really great," Albelda said.
Some female students said they are being more alert and carrying pepper spray.
Anyone who observes suspicious activity is encouraged to contact Evanston police at 847-866-5000 or Northwestern University police 847-491-3456. In the event of an emergency, call 911.