PHOTO: Authorities on Wednesday announced an arrest in an arson fire that destroyed much of the Arizona and Maricopa County Democratic Party headquarters. Phoenix police said 29-year-old Matthew Egler was booked on one count of arson of an occupied structure. In charging documents obtained by KPNX-TV in Phoenix, police said Egler has been a volunteer for the Maricopa County Democratic Party but was banned for behavioral reasons. Investigators say the fire was retaliation after being recently rejected as a volunteer again. “We are deeply saddened and shocked by today’s news, but appreciate the swift action by law enforcement to ensure that the suspect is in custody," state and county Democratic leaders said in a statement.