According to an official release of the North Atlantic Treaty Organization (May 27, 2011)
A total of 8444 sorties, including 3229 strike sorties, have been conducted, since the beginning of the NATO led operation on 31 March 2011. These figures do not include the sorties conducted from March 19 to March 31st
“A total of 21 ships under NATO command are actively patrolling the Central Mediterranean.
10 Vessels were hailed on 26 May to determine destination and cargo. 3 boardings (no diversion) were conducted.
A total of 1060 vessels have been hailed. 56 boardings and 7 diversions have been conducted since the beginning of arms embargo operations.”
For further details see: http://www.nato. int/nato_ static/assets/ pdf/pdf_2011_ 05/20110527_ 110527-oup- update.pdf