The intersection of College and Crown streets was the site of a robbery of a graduate student and his friend this weekend. Four males approached the pair at around 12:47 a.m. on Sunday and demanded their money. Yale Police Department Chief James Perrotti wrote in an e-mail to the Yale community Sunday that no one was hurt in the incident, although he did not specify whether there were any weapons involved. This is the first crime alert e-mail Perrotti has sent since the start of the semester.