Iranian Nobel Peace Prize winner Shirin Ebadi says her sister has been arrested by the intelligence services. Ms Ebadi said her sister Nooshin, a medical professor, was arrested at home on Monday evening, and taken to prison. She said her sister was detained to prevent her own human rights work. According to opposition sources, three journalists and a women's rights campaigner have also been detained, along with several senior opposition figures. Earlier, Tehran rejected international calls for it to halt the crackdown. Iran's government says the violent opposition protests across the country on Sunday, in which at least eight people were killed, were inspired and aided by the West. <br/>