A Pittsburgh paper’s site has a slight update, with quotes from a chapter officer, who reportedly said the chapter takes responsibility for the incident. The police apparently got involved due to calls from residents of the area where the pledges were yelling, running around, and so on at 1:30 or so in the morning.
http://www.post-gazette.com/local/re...s/201411080050
“Mr. Schaible [the vice president of the chapter] did not participate in the events Thursday, but said it was his understanding that Sigma Chi members dropped the pledges off in South Park, a residential neighborhood near Downtown, and tasked them with finding their way back to the fraternity house. The event, he said, was a team-building exercise.
‘We thought we had a good plan going, but I guess things got out of hand,’ he said.”
Edited to add: Can anyone familiar with Morgantown WV give some information about the South Park neighborhood? I've found that it's on the National Register of Historic Places, and that it has a substantial number of single-family dwellings built in the early 1900s. Are the residents generally protective of their neighborhood (not likely to appreciate a noisy group in the early morning hours)? Is it a fairly affluent area of the city that tends to get quick action on complaint calls to police?