KGW-TV, Portland, Ore.

HILLSBORO, Ore. — Detectives on Saturday arrested a registered sex offender while he was allegedly downloading child pornography at a Hillsboro Starbucks, the Washington County Sheriff's Office said.

The lead detective in the case arrested Robert Dietz, 59, for similar crimes in 2009, according to Sgt. Vance Stimler.

Detectives arrested Dietz at the Starbucks located at 1st Avenue and Main Street while he allegedly tried to download child porn using free Wi-Fi, Stimler said.

Dietz was jailed on two counts of encouraging child sex abuse.

Detectives began surveillance at the Starbucks location and identified Dietz as the suspect after receiving several leads in the case, Stimler said.