Per the article in the Oregonian, there have been two arrests made.
Jennifer Marques, 29, and Uriel Vargas, 21, were arrested by U.S. Marshals in Santa Clara, Calif., Wednesday, Portland police said. They were booked into the Santa Clara County Jail and are expected to be extradited to Oregon.
Marques faces assault, unlawful entry of a motor vehicle, harassment and disorderly conduct charges. Vargas is accused of criminal mischief, harassment and disorderly conduct.
You can find more at the article here.
It is good to see some form of resolution coming in this incident. There is no place for violence between fans in MLS, even in this country. And in case you are wondering:
1906 Ultras founder Dan Margarit confirmed that one of the fans arrested in Portland incident is a @1906Ultras member.— Jeff Carlisle (@JeffreyCarlisle) August 29, 2013