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Karroubi, like fellow opposition figures Mir Hossein Mousavi and Zahra Rahnavard, has been kept under strict house arrest for 23 months. Earlier today, Mousavi and Rahnavard's daughters were detained and interrogated for hours before being released.
1505 GMT: Mousavi's Daughters Released. Zahra and Narges Mousavi, daughters of the detained opposition leaders Mir Hossein Mousavi and Zahra Rahnavard, have been released after hours of interrogation in Evin Prison.
The Mousavi daughters were detained this morning in raids on their homes (see 0950 GMT). No reason has been given by authorities.