College officials say the female victims, who are international students, were waiting for a bus a few blocks from campus at 316th and 124th Street when a red, four-door sedan pulled up to them at 10:30 a.m.
A man inside the car pulled out a gun and demanded money and phones from the students. The students complied and the robbers drove away.
None of the students were injured in the robbery.
With a new semester just getting under way, many students are not yet acclimated to the campus.
"Unfortunately, that tends to send a message out to those bad folks that want to take advantage of the situation," said GRCC administrator Vickie Sheehan.
One of the robbers is described as a black man in his early 20s. The man stands roughly 6'2" tall and has an athletic build. At the time of the robbery he was wearing a black and white zip-up hoodie and jeans, according to campus officials.
The second robber is a black woman in her early 20s who stands roughly 5'2" tall. She was wearing red Mickey Mouse pajamas with a hooded sweatshirt under a black jacket.
Campus officials are advising students and visitors to walk in groups, keep cell phones and electronic devices hidden and report any suspicious activity they see.
The college is also adding an additional Safety Ride van until 8 p.m. and has extended its service area to 308th Place.
Though it does not appear the crimes are linked, campus security workers say two cars were also stolen from campus parking lots on Monday.
Student Jon Mayer parked his car in one of the lots Sunday night and was stunned to learn of the thefts.
"It's all a surprise to me, but that's pretty scary knowing that cars getting stolen out of here," he said.