German authorities say they have arrested a German-Iranian man suspected of supplying Iran with components for use in its missile program.

Federal prosecutors said Wednesday that Dr. Ali Reza B., whose last name wasn’t given in accordance with German privacy laws, is accused of providing Iran with equipment worth nearly €230,000 ($315,000) in 12 deliveries from 2011 to 2013.

He’s accused of providing so-called dual-use items that have civilian but also military purposes, like vacuum pumps and valves. The items were manufactured in Germany and other countries.

Prosecutors allege the suspect delivered the items via a company in an unidentified “neighboring Arab country” of Iran to avoid embargo restrictions.

He was arrested Tuesday in the Bonn area and ordered held by a judge as the investigation continues.

Earlier this week, a Greek newspaper reported that Greek authorities had intercepted arms shipments apparently sent by one or more Israelis and intended for Iran, in violation of international sanctions.

Greek officials, working together with the American Homeland Security Investigations agency, uncovered two shipments of spare parts for F-4 Phantom jets in December 2012 and again in April 2013, the Kathimerini daily reported over the weekend.

A Greek court ordered the shipments confiscated and transferred to the Americans, according to Kathimerini, which claimed to have a copy of the investigation report.

Israeli officials declined Sunday to comment on the report which, if true, would represent a shocking effort by Israelis to supply arms to the country’s most bitter enemy.

Discussions began Tuesday on a final accord between Iran and six world powers over its nuclear program, but Western officials have expressed skepticism that negotiations will succeed, and Tehran said as talks began that it would not close any of its nuclear facilities, a key demand of the West.