Massive Irvine PD Presence at Campus and W Peltason, why?

I don't know when it all started, but at 1330 hours there were at least (20) Irvine PD vehicles at the UTC/UCI intersection of Campus and West Peltason.

(9) squad cars, (2) vans, (1) undercover SUV, and (8) motorcycles. There was no obvious sign of a collision, accident, or general disturbance as of 1330. Officers were taking statements from a few groups of people.

Does anyone know why?

Pic: http://imgur.com/SzqsyU9