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The area, roughly 10 blocks from the major Waterloo train and Underground station, is extremely congested during the morning rush hour. Many commuters arrive at the main line stations from London’s southern suburbs and transfer to buses or trains there.

Aviation expert Chris Yates said that weather may have played a role. Investigators also would look at whether the crane had navigation lights.

“The question then becomes whether the pilot was fit,” Yates said.

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Associated Press writers Robert Barr, Danica Kirka, Jill Lawless, Gregory Katz and Paisley Dodds contributed to this report.