ISTANBUL — Istanbul ’s jailed mayor was questioned Sunday at the city’s main courthouse as part of a newly launched investigation into possible charges of espionage.

Hundreds of supporters gathered outside in a show of support for Ekrem Imamoglu, an opposition politician considered to be a rival to President Recep Tayyip Erdogan.

The espionage investigation, launched two days ago, centers on alleged links between Imamoglu’s political campaign and a man arrested in July accused of conducting intelligence activities on behalf of foreign states. Imamoglu’s former campaign manager, Necati Ozkan, and journalist Merdan Yanardag were also questioned as part of the probe.

Imamoglu was questioned for some three hours, the country's pro-opposition Cumhuriyet newspaper reported.

Held in pretrial

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