The Yemeni authorities have released on Saturday the wife of Ahmed Al-Ghadir, a key suspect of the assassination attempt against the outgoing President Ali Abdullah Saleh occurred on June 3, 2011, rights group said.
Al-Ghadir who worked at the mosque on Saleh's presidential compound, the site of the June 3 assassination attempt, has disappeared since the event.
The wife of Al-Ghadir, Mahdia Alnofi along with some relatives, were disappeared a day after the event.
Hood said her father, aged 70, was also released, but her brother ,Yahya is still detained.
Al-Ghadir, one of three preachers working at the mosque of the presidential palace in the capital Sana'a, arrived at the mosque earlier on June 3 and spent almost two hours there.
This release came after enforced disappearances in custodies of the National Security run by Amar Mohammad Saleh, nephew of President Saleh.
Relatives of Alnofi told a Yemeni online newspaper, Al-Masdar, that Alnofi and her father were put in s solitary confinements for there months.
They further said that her health deteriorated so badly, to the extent that her family could not identify.
She was threatened with detention in case she speaks to media about her detention conditions and its case generally, the sources added.
The attack against Saleh had killed the chief of Shura Council, Abdul-Azeez Abdul-Ghani and 11 of Saleh's bodyguards.
High-ranking officials, including Prime Minister Ali Mujawar, Deputy Prime Minister for Defense and Security Affairs Rashad al-Alimy, and Parliament Speaker Yahya al-Raiee were injured.
The embattled president of Yemen arrived Saturday in the United States for medical treatment for burns he suffered during an assassination attempt. His journey had taken him from Oman, through London.