Israel expressed Expressing_publicly regret over the deaths , and sent Sending a letter of apology Statement to Egypt. < ref name= '' NYT2011/10/12 '' > < /ref > The IDF was ordered Arranging to conduct Action a military probe Scrutiny of the incident , and on August 25 , 2011 , Israel agreed Agree_or_refuse_to_act to a joint investigation Research with Egypt of the events .