Police in Jordan say they have arrested a woman suspected of having wanted to blow herself up in a series of suicide bombings in Amman.
It is unclear where and when police arrested the woman
Police say the Iraqi woman is the wife of one of three Iraqi male suicide bombers who attacked three hotels on Wednesday, killing 57 people.
Deputy Prime Minister Marwan Muasher said she was also the sister of a dead key aide to Abu Musab al-Zarqawi.
Zarqawi's al-Qaeda in Iraq group has claimed responsibility for the attacks.
The three Iraqi bombers, who died in the attacks, were identified as Ali Hussein Ali al-Shamari, from Anbar province, Rawad Jassem Mohammed Abed, 23, and Safaa Mohammed Ali, 23.
The woman was identified as Sajida Mubarak Atrous al-Rishawi, 35, and she was married to Shamari.
Mr Muasher said she was the sister of Mubarak Atrous al-Rishawi, a Zarqawi lieutenant who was killed by US forces in Falluja.
Earlier this week, an internet statement attributed to al-Qaeda in Iraq named four bombers it said carried out the Amman attacks, naming them as Abu Khabib, Abu Muaz, Abu Omaira and Om Omaira.
Speaking at a news conference, Mr Muasher showed reporters photographs of a suicide bomb belt packed with ball bearings that the would-be bomber was said to have been wearing at the time of the attacks.
He said she would make a statement on Jordanian television later in the day.
She is suspected of having been involved in the preparation of the attack on the Radisson hotel. The Grand Hyatt and Days Inn in Amman were also hit in the bombings.
Mr Muasher said that the husband and wife, dressed as though they were going to a party, entered a ballroom at the Radisson where a wedding reception was being held, wearing explosives belts under their clothes.
She failed to detonate hers after apparently struggling with its primer cord, Mr Muasher said. Noticing the woman struggling, her husband asked her to leave and then blew himself up.
The four Iraqis are said to have entered Jordan by car on 5 November. They rented an apartment in a suburb of Amman a couple of days later.
They took taxis from the apartment to their targets on the day of the bombings.
1. Vehicle explodes outside hotel after being stopped at a police checkpoint
2. In the most deadly attack, a bomb destroys a banquet room where a wedding reception was being held. Dozens injured by shrapnel
3. Suicide attacker detonates bomb in hotel bar, just before 2100 local time. Two senior Palestinian officials are among the dead