` ` There 's no doubt these are difficult days , '' president says . But ` ` the United States of America will never retreat from the world , '' Obama says . Prime minister says reason for arrests is based on photos around compound , witnesses . Obama vowed Thursday that those responsible for the attack would be brought to justice . An aide says those photos are not directly related to the attacks .
` ` There 's no doubt these are difficult days , '' president says . But ` ` the United States of America will never retreat from the world , '' Obama says . Prime minister says reason for arrests is based on photos around compound , witnesses . An aide says those photos are not directly related to the attacks .