Abroad, authorities in France, England and Germany sought or detained ਍਀瀀漀琀攀渀琀椀愀氀 眀椀琀渀攀猀猀攀猀 愀猀 椀渀瘀攀猀琀椀最愀琀漀爀猀 琀爀愀挀欀攀搀 琀栀攀 洀漀瘀攀洀攀渀琀猀 漀昀 琀栀攀 瀀氀漀琀琀攀爀猀 戀愀挀欀 ഀ and forth across the Atlantic. At home, investigators focused on myriad sites, ਍਀昀爀漀洀 愀渀 愀瀀愀爀琀洀攀渀琀 戀甀椀氀搀椀渀最 椀渀 䨀攀爀猀攀礀 䌀椀琀礀 琀漀 愀 栀漀猀瀀椀琀愀氀 椀渀 匀愀渀 䄀渀琀漀渀椀漀 琀漀 愀 ഀ Gold's Gym in Greenbelt.

Nuggets of information emerged that fueled fresh queries.

Were other hijackings in the works? Federal investigators found box-cutters ਍਀漀渀 愀琀 氀攀愀猀琀 琀眀漀 洀漀爀攀 愀椀爀瀀氀愀渀攀猀 猀攀愀爀挀栀攀搀 愀昀琀攀爀 琀栀攀 愀琀琀愀挀欀猀⸀ 吀眀漀 洀攀渀 漀渀 愀渀漀琀栀攀爀 ഀ flight -- scheduled to fly from Newark to San Antonio via St. Louis -- the day ਍਀漀昀 琀栀攀 愀猀猀愀甀氀琀猀 眀攀爀攀 氀愀琀攀爀 愀爀爀攀猀琀攀搀 挀愀爀爀礀椀渀最 戀漀砀ⴀ挀甀琀琀攀爀猀⸀㰀⼀倀㸀ഀ

Were the hijackers or any of their associates employed in the airline ਍਀椀渀搀甀猀琀爀礀 漀爀 愀戀氀攀 琀漀 愀挀挀攀猀猀 猀攀挀甀爀攀 愀椀爀瀀漀爀琀 愀爀攀愀猀㼀 䄀 戀愀最 氀攀昀琀 戀攀栀椀渀搀 愀琀 䈀漀猀琀漀渀✀猀 ഀ Logan International Airport by Mohamed Atta, one of the hijackers, included ਍਀愀椀爀氀椀渀攀 甀渀椀昀漀爀洀猀⸀ 吀眀漀 洀攀渀 愀爀爀攀猀琀攀搀 椀渀 䐀攀琀爀漀椀琀 氀愀猀琀 眀攀攀欀 栀愀搀 瀀爀攀瘀椀漀甀猀氀礀 眀漀爀欀攀搀 ഀ for an airline food service.

One of the most interesting was Nabil Almarabh, a former Boston taxi driver ਍਀眀椀琀栀 氀椀渀欀猀 琀漀 伀猀愀洀愀 戀椀渀 䰀愀搀攀渀Ⰰ 琀栀攀 眀攀愀氀琀栀礀 匀愀甀搀椀 挀爀甀猀愀搀攀爀 椀搀攀渀琀椀昀椀攀搀 戀礀 ഀ President Bush as the mastermind of the hijackings. Over the past 18 months, ਍਀唀⸀匀⸀ 䌀甀猀琀漀洀猀 匀攀爀瘀椀挀攀 愀最攀渀琀猀 攀猀琀愀戀氀椀猀栀攀搀 琀栀愀琀 䄀氀洀愀爀愀戀栀 栀愀搀 昀椀渀愀渀挀椀愀氀 搀攀愀氀椀渀最猀 ഀ with two of the hijackers, law enforcement authorities said.

The FBI also arrested a San Antonio radiologist, describing him as a material ਍਀眀椀琀渀攀猀猀 眀椀琀栀 瘀愀氀甀愀戀氀攀 椀渀昀漀爀洀愀琀椀漀渀⸀ 䄀甀琀栀漀爀椀琀椀攀猀 眀栀漀 挀漀渀昀椀猀挀愀琀攀搀 挀漀洀瀀甀琀攀爀猀 栀攀 甀猀攀搀 ഀ at a University of Texas hospital would not comment on news accounts that said ਍਀䄀氀ⴀ䈀愀搀爀 䴀漀栀愀洀洀攀搀 䠀⸀ 䄀氀ⴀ䠀愀稀洀椀 眀愀猀 挀漀渀渀攀挀琀攀搀 琀栀爀漀甀最栀 昀椀渀愀渀挀椀愀氀 搀攀愀氀椀渀最猀 琀漀 琀栀攀 ഀ hijacking plot.

At least two assumed the identities of Saudi Arabian citizens whose passports ਍਀眀攀渀琀 洀椀猀猀椀渀最 礀攀愀爀猀 愀最漀 椀渀 䐀攀渀瘀攀爀 愀渀搀 䌀愀椀爀漀Ⰰ 琀栀攀 匀愀甀搀椀 攀洀戀愀猀猀礀 爀攀瀀漀爀琀攀搀⸀ 伀琀栀攀爀猀 ഀ shared e-mail accounts and credit cards, moving frequently between residences, ਍਀猀琀愀琀攀猀 愀渀搀 挀漀甀渀琀爀椀攀猀⸀㰀⼀倀㸀ഀ

Investigators recovered the flight data recorder and cockpit voice recorder ਍਀昀爀漀洀 唀渀椀琀攀搀 䄀椀爀氀椀渀攀猀 䘀氀椀最栀琀 㤀㌀Ⰰ 眀栀椀挀栀 挀爀愀猀栀攀搀 椀渀 猀漀甀琀栀眀攀猀琀攀爀渀 倀攀渀渀猀礀氀瘀愀渀椀愀 漀渀 ഀ Sept. 11. Passengers who made farewell calls from the airliner had said they ਍਀椀渀琀攀渀搀攀搀 琀漀 挀栀愀爀最攀 琀栀攀 栀椀樀愀挀欀攀爀猀 椀渀 愀渀 愀琀琀攀洀瀀琀 琀漀 爀攀琀愀欀攀 琀栀攀 瀀氀愀渀攀⸀ 䌀漀挀欀瀀椀琀 ഀ microphones captured shouts in English and Arabic, but investigators remain ਍਀甀渀猀甀爀攀 眀栀愀琀 栀愀瀀瀀攀渀攀搀⸀㰀⼀倀㸀ഀ

"There are screams in the background. But I don't think it is conclusive on ਍਀眀栀愀琀 栀愀瀀瀀攀渀攀搀 琀漀 挀愀甀猀攀 琀栀攀 樀攀琀 琀漀 挀爀愀猀栀Ⰰ∀ 愀 最漀瘀攀爀渀洀攀渀琀 漀昀昀椀挀椀愀氀 猀愀椀搀 礀攀猀琀攀爀搀愀礀⸀ ഀ The recording and the data recorder are still being analyzed.

Managers of a flight school in Eagan, Minn., alerted the FBI on Aug. 13 to a ਍਀洀愀渀 眀栀漀 栀愀搀 渀攀瘀攀爀 昀氀漀眀渀 猀漀氀漀 椀渀 愀 猀椀渀最氀攀ⴀ攀渀最椀渀攀 瀀氀愀渀攀 礀攀琀 眀愀渀琀攀搀 琀爀愀椀渀椀渀最 漀渀 愀 ഀ Boeing 747 simulator. Moussaoui told officials at the Pan Am International ਍਀䘀氀椀最栀琀 匀挀栀漀漀氀 琀栀愀琀 栀攀 搀椀搀渀✀琀 挀愀爀攀 愀戀漀甀琀 琀愀欀攀漀昀昀猀 漀爀 氀愀渀搀椀渀最猀⸀ 䠀攀 樀甀猀琀 眀愀渀琀攀搀 琀漀 ഀ learn to steer.

Aicha Moussaoui told a French magazine that her son converted to a strict ਍਀昀漀爀洀 漀昀 䤀猀氀愀洀 眀栀椀氀攀 氀椀瘀椀渀最 椀渀 䈀爀椀琀愀椀渀 椀渀 琀栀攀 ㄀㤀㤀　猀⸀ 匀栀攀 挀愀氀氀攀搀 椀琀 愀 ∀爀攀愀氀 ഀ brainwashing."

Librarians reported that hijackers used public computers in the weeks before ਍਀琀栀攀 挀爀椀洀攀⸀ 䤀渀 䐀攀氀爀愀礀 䈀攀愀挀栀Ⰰ 䘀氀愀⸀Ⰰ 氀椀戀爀愀爀椀愀渀 䬀愀琀栀氀攀攀渀 䠀攀渀洀愀渀 猀愀椀搀 琀栀爀攀攀 栀椀樀愀挀欀攀爀猀 ഀ monitored her as they surfed, making sure that she could not see their work. The ਍਀䘀䈀䤀 猀攀椀稀攀搀 挀漀洀瀀甀琀攀爀猀 昀爀漀洀 䐀攀氀爀愀礀 䈀攀愀挀栀 愀渀搀 䈀爀漀眀愀爀搀 䌀漀甀渀琀礀 愀渀搀 爀攀焀甀攀猀琀攀搀 挀漀洀瀀甀琀攀爀 ഀ lab sign-in sheets from Sherwood Regional Library in Fairfax County.

Closer to Washington, suburban Maryland was the base of operations for the ਍਀䄀洀攀爀椀挀愀渀 䄀椀爀氀椀渀攀猀 䘀氀椀最栀琀 㜀㜀 栀椀樀愀挀欀攀爀猀 椀渀 琀栀攀 眀攀攀欀猀 戀攀昀漀爀攀 匀攀瀀琀⸀ ㄀㄀⸀ 吀栀攀 䘀䈀䤀 ഀ traced the five men to a pair of budget motels on Route 1 in Laurel. Hani ਍਀䠀愀渀樀漀甀爀Ⰰ 琀栀攀 猀甀猀瀀攀挀琀攀搀 瀀椀氀漀琀 漀昀 䘀氀椀最栀琀 㜀㜀 眀栀攀渀 椀琀 琀甀爀渀攀搀 琀漀眀愀爀搀 琀栀攀 倀攀渀琀愀最漀渀Ⰰ ഀ paid an instructor at Freeway Airport in Bowie to guide him on three flights in ਍਀䄀甀最甀猀琀⸀㰀⼀倀㸀ഀ

And all five hijackers, within two weeks of their assault, spent time lifting ਍਀眀攀椀最栀琀猀 愀琀 䜀漀氀搀✀猀 䜀礀洀 椀渀 䜀爀攀攀渀戀攀氀琀⸀ 吀栀爀攀攀 漀昀 琀栀攀 洀攀渀 戀漀甀最栀琀 琀攀洀瀀漀爀愀爀礀 ഀ memberships, while the other two joined them on occasion,.