A woman in Jordanian custody said in a televised confession said that she had tried to blow herself up alongside her husband in an Amman hotel last week.
"We went into the hotel. He (my husband) took a corner and I took another. There was a wedding in the hotel. There were women and children," the woman, who police identified as Sajida al-Rishawi, said on Jordan's state-run television.
A video grab image shows Sajida al-Rishawi who confessed on Jordanian TV
"My husband executed the attack. I tried to detonate and it failed. People started running and I ran with them," Rishawi said during a recorded television appearance.
Three suicide bombers killed more than 50 people at three Amman hotels on Wednesday.
Officials said Rishawi's husband was a bomber who died in one of three simultaneous attacks at the Hyatt, Radisson and Days Inn hotels. It was not clear under which circumstances Rishawi gave her confession. She spoke with an Iraqi accent and said that she came from the Iraqi city of Ramadi.
Officials said Rishawi is the sister of Samir Mubarak Atrous al-Rishawi, a former senior aide to al Qaeda in Iraq leader Abu Musab al Zarqawi. Al Qaeda in Iraq has claimed responsibility for the bombings. Al Qaeda in Iraq said in an Internet statement that a married couple and two other men - all Iraqis - had carried out the bombings at hotels frequented by Western security contractors who operate out of Iraq and by diplomats.
Most of those who died were Jordanians attending weddings.
Jordan had previously been spared al Qaeda-linked attacks that have hit other countries. But authorities had warned that Zarqawi, who has a $25 million bounty on his head, had sent his followers to strike targets outside Iraq, including Jordan.