SAN FRANCISCO (AP) — Three Chinese nationals educated and employed in the United States and three others have been charged with stealing U.S. wireless technology.

Federal prosecutors say 36-year-old Hao Zhang, 35-year-old Wei Pang and 34-year-old Huisui Zhang met at the University of Southern California a decade ago and conspired to steal trade secrets from two of their U.S. employers after graduating. Hao Zhang and Pang are professors at the state-run Tianjin University.

The indictment unsealed Tuesday charges the six with conspiring to steal technology developed by two U.S. companies that eliminates interference from wireless communications.

Hao Zhang was arrested Saturday at Los Angeles International Airport after arriving on a flight from China. It's unclear if he has retained an attorney.

The other five charged in the indictment are believed to be in China.