In May 2011, U.S. Special Operations forces killed bin Laden during a nighttime raid on the compound in Pakistan where he had been living in secret.

WSJ: U.S. Captures bin Laden Son-in-Law

Therefore, full safe clearance is never done during the day (except in emergency repair situations), and nighttime is the only time all the major maintenance work can be completed.

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After his capture during a nighttime operation between Tuesday and Wednesday, he was delivered to the Albanian government.

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