Bethlehem Police are investigating after three Lehigh University students were robbed within the last 48 hours.

The first incident happened early Sunday morning at Boyer and Summit streets.

Police said a 22-year-old Lehigh student was robbed by two men who said they had a gun.

Two more robberies were reported late Monday --within about 15 minutes of each other.

Police said a man armed with a gun held up a student around 11:40 p.m. in the 500 block of Montclair Avenue and stole $4 from him.

Shortly after that, a man believed to be the same individual robbed another student on campus. He is described as being about six feet tall and about 180 pounds.

None of the students were injured.

Lehigh officials said campus security will be increasing patrols around the university and they urge students to utilize the Safety Escort Service by calling 610-758-1111 or use the Take A Ride Around Campus Safety service when traveling on campus at night.