A force of 1,700 Marines occupied an area containing a number of foreign embassies , the locale was proclaimed an International Security Zone by the Organization of American States earlier in the day , OAS also issued a resolution calling the combatants to end all hostilities .
A force of 1,700 Marines occupied an area containing a number of foreign embassies , the locale was proclaimed an International Security Zone by the Organization of American States ( OAS ) . 
 Earlier in the day , OAS also issued a resolution calling the combatants to end all hostilities .