An Iranian opposition website says authorities have detained the son of opposition leader Mahdi Karroubi.

The Tuesday report on Sahamnews.net also says Ali Karroubi was taken into custody on Monday. Ali is not known as an activist, and his detention is widely viewed as at attempt to gain leverage on his father.

The website also says security forces raided the elder Karroubi's house, locking him and his wife Fatemeh in separate rooms and confiscating books and documents.

Karroubi and fellow opposition leader Mir Hossein Mousavi have been under house arrest since organizing a rally last week.

At least two people were killed Feb. 14 in clashes between security forces and opposition protesters in Tehran. The rallies were the opposition's largest in more than a year.