Judiciary says a criminal case has been opened after online images showed a number of unveiled female competitors

Judicial authorities in Iran have arrested two organisers of a marathon held on an island off the country’s southern coast after images emerged showing women taking part in the race without hijabs.

The arrests on Saturday come as the authorities face increasing criticism from ultraconservatives who accuse them of inadequate efforts to enforce a mandatory headscarf law for women amid fears of growing western influence on the Islamic republic.