WASHINGTON (AP) – After initial optimism Tuesday, U.S. law enforcement officials backed off claims that Pakistan had detained a former Boston woman wanted by the FBI for questioning about possible links to al-Qaida.

Two federal law enforcement officials, speaking on condition of anonymity, initially said 31-year-old Aafia Siddiqui recently was taken into custody by Pakistani authorities.

Pakistani officials never confirmed the arrest and later the U.S. officials amended their earlier statements, saying new information from the Pakistani government made it “doubtful” she was in custody.

It was not clear whether a different woman had been arrested or if the initial information was wrong or misconstrued by U.S. officials.

There had been several reports out of Pakistan prior to Tuesday claiming Siddiqui had been detained, but all turned out to be untrue. The U.S. officials said that while earlier reports never were given much credibility by federal authorities, Tuesday’s information at first appeared legitimate.

The FBI in March put out a global alert for Siddiqui, who has a biology degree from the Massachusetts Institute of Technology and wrote a doctoral thesis on neurological sciences at Brandeis University in 2001. She also visited the Maryland suburbs near Washington in December or January, officials say.

Authorities have not charged that Siddiqui is a member of al-Qaida but believe she could be a “fixer,” someone with knowledge of the United States who can support and help get things done for other operatives. She is not charged with any crime in the United States.

The FBI also is seeking to question Siddiqui’s estranged husband, Dr. Mohammed Khan. His whereabouts are unknown.

Alerts for Siddiqui and Khan followed the FBI’s announcement last month of a worldwide search for Adnan El Shukrijumah, a 27-year-old Saudi native nicknamed “Jafar the Pilot.” He lived for a number of years in South Florida and authorities believe he is an al-Qaida operative who may have been planning new attacks. His family denies any terrorist ties and he has not been located.

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AP-ES-04-22-03 1708EDT