The Iranian security forces arrested a Swedish citizen on charges of espionage, the Ministry of Security said on Saturday. The authorities had been monitoring his movements since he entered Iranian territories.

"The suspect was in contact with suspicious European and non-European personnel in Iran," the ministry said in a statement. "The spy had visited the occupied Palestinian territories before heading to Iran."

"Iran's security is a red line, and it will respond firmly to the smallest security attack on the country's security borders," Tehran added.

The Islamic Republic pointed out that Sweden previously supported several proxy spies working for the occupation "and it keeps safe on its land terrorists and criminals who have killed innocent people in Iran."

"If Sweden continues this approach of proxy spying and supporting terrorists, it will receive the appropriate response," the statement concluded.

Iranian Intelligence Police announced on Thursday the arrest of the chief and members of an espionage network working for the Israeli occupation before they could carry out any operation.

In a press release, the Intelligence Organization of the Law Enforcement Command indicated that the network of five members was encouraged by a separatist leader to connect with the Mossad.

According to the press release, the network worked on collecting information regarding critical locations in Iran, as well as carrying out arson attacks and spreading propaganda against the Iranian regime.

Incentivized by the Israeli Mossad, the espionage network received enough training to carry out sabotage and armed operations.