"Zainab is free and she is home with her family," Mohammed al-Jishi said adding that she was supposed to be released yesterday, when her two month sentence came to an end.

He said she was released "after orders from the attorney general."

Zainab, daughter of prominent activist Abdulhadi al-Khawaja who is serving a life sentence for plotting against the state, was arrested while protesting on August 2.

She was sentenced to two months in prison for destroying property belonging to the ministry of interior, said Jishi.

According to Amnesty International, the government property referred to in the conviction was a "picture of Bahrain's king" which she "allegedly tore" while in detention.