Osama bin Laden kept pressing followers to find new ways to hit the U.S. while he was deep in hiding and his organization was becoming battered and fragmented, officials say, citing his private journal and other documents recovered in last week's raid.

Strike smaller cities, bin Laden suggested. Target trains as well as planes. Above all, kill as many Americans as possible in a single attack.

Though he was out of the public eye and al-Qaeda seemed to be weakening, bin Laden never yielded control of his worldwide organization, U.S. officials said Wednesday.

His personal, handwritten journal and his massive collection of computer files reveal his hand at work in every recent major al-Qaeda threat, including plots in Europe last year that had travellers and embassies on high alert, two officials said.

They described the intelligence to The Associated Press only on condition of anonymity because they were not authorized to talk publicly about what was found in bin Laden's hideout. Analysts are continuing to review the documents.

The information shatters the government's conventional thinking about bin Laden, who had been regarded for years as mostly an inspirational figurehead whose years in hiding made him too marginalized to maintain operational control of the organization he founded.

Instead, bin Laden was communicating from his walled compound in Pakistan with al-Qaeda's offshoots, including the Yemen branch that has emerged as the leading threat to the United States, the documents indicate.

Though there is no evidence yet that he was directly behind the attempted Dec. 25 Christmas Day 2009 bombing of a Detroit-bound airliner or the nearly successful attack on cargo planes heading for Chicago and Philadelphia, it is now clear that they bear some of bin Laden's hallmarks.

Don't limit attacks to New York City, he said in his writings. Consider other areas such as Los Angeles or smaller cities. Spread out the targets.

In one particularly macabre bit of mathematics, bin Laden's writings show him musing over just how many Americans he must kill to force the U.S. to withdraw from the Arab world.

He concludes that small attacks had not been enough. He tells his disciples that only a body count of thousands, something on the scale of the Sept. 11, 2001, attacks, would shift U.S. policy.

He also schemed about ways to sow political dissent in Washington and play political figures against one another, officials said.

The communications were in missives sent via plug-in computer storage devices called flash drives.

The devices were ferried to bin Laden's compound by couriers, a process that is slow but exceptionally difficult to track. Intelligence officials have not identified any new planned targets or plots in their initial analysis of the 100 or so flash drives and five computers that an assault team of Navy SEALs hauled away after killing bin Laden.