Six youths, one of whom was brandishing a brick, threatened a 20-year-old male Penn alumnus early Sunday evening near Harrison College House and robbed him of $60.
The crime occurred around 6 p.m. as the victim walked on the 3900 block of Irving Street.
The juveniles, all of whom are described as about 15 years old, surrounded the alumnus and demanded his wallet.
One, wearing a black coat, black jeans and a black and gray skull cap, wielded a brick and threatened to strike the victim if he did not surrender the wallet.
The victim, who was not injured, complied.
After he surrendered the wallet -- which contained the cash, credit cards and identification -- the attackers ran west on Irving Street.
A passerby recovered the wallet, without the cash, later that evening on the 200 block of South 40th Street and turned it over to police.
Police have not made any arrests in the case.
In a separate incident, a 17-year-old male Penn freshman was injured early Saturday morning in an assault.
The student was walking south on the unit block of South 34th Street at about 2:15 a.m. when a man punched him once in the face and fled.
No theft was reported in connection with the attack.
The student sought treatment Saturday afternoon at Penn's Student Health Service for minor facial injuries.
The incident was not reported to police until Saturday afternoon.
Police have made no arrests in the case and have not uncovered any motive for the attack.
