A French employee of France’s Consulate in Jerusalem is under arrest for allegedly smuggling dozens of weapons from the Gaza Strip to the West Bank, Israel’s domestic security agency said Monday.

The Shin Bet said the man, identified as Romain Franck, 23, was part of a broader Palestinian smuggling ring. It said he used his consular vehicle, which is subjected to more lenient security checks, to transport the weapons through Israel’s tightly secured border with the Gaza Strip. It said he took part in the ring for financial gain and that his employer was unaware of his actions.

The French Embassy in Israel issued a statement confirming that a consulate employee had been arrested, saying it was treating the incident with “great importance,” but wouldn’t discuss the case itself. The embassy said it was in contact with Israeli authorities and the suspect’s family, and was opening an internal investigation into the matter.

On Monday, Israel charged Franck with conspiracy to commit a crime and multiple weapons offenses, among other counts.

“This is a very serious incident in which the privileges and immunity granted to foreign missions in Israel were cynically exploited to smuggle dozens of weapons that could be used in terror attacks,” the Shin Bet statement said.

The Shin Bet said Franck transferred a total of 70 handguns and two assault rifles on five occasions over recent months. It said he received the arms from a Gaza man employed at the French cultural center in Gaza and brought them to someone in the West Bank, where they were then sold to arms dealers.

The Shin Bet said Franck, who was arrested in February, confessed to the charges. A gag order on the case was lifted Monday.

According to the indictment, Franck was a driver for the consulate and would ferry diplomatic staff between Gaza and Jerusalem. He would transport the arms in packages or suitcases in the trunk of the consular car and lie to Israeli security guards at the Gaza border crossing when asked if he was carrying any weapons. The indictment said Franck earned thousands of dollars for moving the guns.

Israeli officials believe that consular immunity would not apply in this case.

The Shin Bet sent reporters a picture of what it said was the consular vehicle, a silver SUV. It was not clear from the photo whether the vehicle carried the white license plates of the consular corps.

Nine people, including Franck, were arrested, the Shin Bet said. Among the suspects is a Palestinian security guard at the French Consulate in Jerusalem.

The Shin Bet said French authorities were kept aware of developments on the case during the investigation.

Israel has previously accused Palestinians employed by the U.N. or non-governmental organizations of participating in hostile activities, including collaborating with Gaza’s militant Hamas rulers. But allegations against international staffers are rare.