The students, ages 18 and 19, were at the skate park near East Roosevelt Road and South Michigan Avenue in Chicago's South Loop around 12:20 a.m. when they were approached by three males, police said.
At least one of the suspects implied he had a weapon, police said. The thieves allegedly took the students' cell phones and ran. The students were not hurt.
Four other robberies have occurred in the area since Nov. 8:
-About 9:30 p.m. Nov. 8 in the 200 block of East Balbo;
-About 9:30 p.m. Nov. 9 in the 100 block of East Balbo;
-About 8:05 p.m. Nov. 12 in the 500 block of South Michigan; and
-About 10:30 p.m. Nov. 20 in the 600 block of South Michigan.
A 22-year-old man walking near Grant Park on Nov. 20 was beaten and robbed by a group of at least four males.
Police issued a community alert that said the suspects are described as black males and females, thought to be between 15 and 20 years old, standing about 5-foot-7 and weighing about 130 pounds, police said. The suspects were wearing black bandanas, green hooded sweatshirts and baseball caps.
Roosevelt University issued a warning to their students after the violent robbery on Nov. 12, which occurred near campus. A 16-year-old girl was charged in connection with that incident.
Anyone with information on the robberies is asked to contact Area Central detectives at (312) 747-8384.