Iranian authorities have detained a German national for allegedly taking photos of "sensitive oil centers" in the southern province of Khuzestan, local media report.
Tasnim news agency, which is affiliated with the Islamic Revolutionary Guards Corps, said on January 17 that the German citizen was arrested while taking pictures of oil facilities in Omidiyeh.
Jam-e Jam daily, which is owned by Iran's state broadcaster, also reported the arrest.
The reports did not provide further details, and officials in Iran and Germany did not immediately comment on the matter.
Iranian security services have taken some 40 foreign nationals into custody, often without revealing any charges, since an ongoing wave of nationwide protests erupted in mid-September.
The Islamic Republic has claimed that the anti-government demonstrations are instigated by its foreign foes. Officials did not provide any evidence backing the allegation.
Many European countries have urged their nationals to leave Iran, warning that they face the risk of arbitrary arrest or unfair trial.
Western governments have repeatedly accused the Islamic Republic of taking dual and foreign nationals hostage for the sole purpose of using them in prisoner swaps.