On a top secret mission on May 1, 2011 (UTC), Navy SEALs crossed deep into Pakistani territory to attack a compound suspected to be occupied by Osama bin Laden in Abottabad, Pakistan.
Since 2004, American forces had attacked targets in Pakistan, but almost exclusively operated in rural northwest Pakistan just inside the border from Afghanistan. The justification being that this semi-autonomous, rural area lacked proper control by the Pakistani authorities -- cross border raids were too big of a threat to American security.