An Iranian news agency is reporting the country's main opposition leader has returned home after medical examinations for a heart ailment.

The report late Thursday by the state-owned YJC.ir says Mir Hossein Mousavi is in good condition but must continue medical treatment at home.

Mousavi, 70, ran against President Mahmoud Ahmadinejad in the 2009 election. Reformers charged that Ahmadinejad's victory was fraudulent, and demonstrations rocked Iran for weeks. Then Iranian authorities moved against the opposition.

Mousavi and fellow opposition leader Mahdi Karroubi have been effectively silenced. Mousavi has been under house arrest since widespread crackdowns in early 2011.

This was the first official confirmation of Mousavi's condition after foreign-based opposition figures and websites said Thursday that he was undergoing cardiac tests in a hospital.