A string of robberies and assaults committed by juveniles occurred on and near campus at the beginning of July.
Police credit an increased presence with ending the crime wave quickly.
Juveniles allegedly committed two robberies, three assaults, an indecent assault and a theft in the Penn patrol zone between July 3 and July 10.
All of the incidents except for the indecent assault occurred on Locust Street between 37th and 42nd streets.
In all of the incidents, complainants were attacked by groups of juveniles around the ages of nine to 13.
No crimes of that nature have been reported in the Penn patrol zone since July 10.
To curb the trend, Penn and Philadelphia police officials said they increased their presence in the area and utilized CCTV cameras to monitor potential criminal activity.
Penn Police deployed additional covert and overt officers to the area to "saturate our patrol zone and increase our visibility," chief Mark Dorsey said in a statement.
A number of juveniles were arrested for curfew violations and disobeying city ordinances or were questioned for loitering in the weeks following the crime wave.
These efforts - and the publicity the crimes generated - likely prevented juvenile criminals from returning to campus, police said.
A week after the incidents, Sgt. Charles Layton of the Philadelphia Police said would-be juvenile criminals were "feeling heat from the police and the community."
"They're realizing everyone's aware of the situation," he said.
One robbery resulted in the arrest of two male juveniles, ages 13 and 16. Penn Police officers also stopped male juveniles after two assaults on July 7. In those cases, no arrest was made because the complainants could not positively identify the suspects, then-Division of Public Safety spokeswoman Karima Zedan said.
Still, the pedestrian stops are "a proactive way of preventing these kids from coming back here," Vice President for Public Safety Maureen Rush said.
Three Penn students, one professor and a University employee were among the complainants.
Two complainants - the professor and the Penn employee - received medical treatment at the Hospital of the University of Pennsylvania and have both since been released.
